---
product_id: 13425518
title: "Tetra Whisper 135 GPH Internal Power Filter For Aquariums | For Fish Tanks Up To 30 Gallons, Whisper Quiet, 3-Stage Filtration, Space-Saving Internal Filter Clips on Tank"
brand: "tetra"
price: "€ 77.04"
currency: EUR
in_stock: true
reviews_count: 13
category: "Tetra"
url: https://www.desertcart.sk/products/13425518-tetra-whisper-135-gph-internal-power-filter-for-aquariums-fish
store_origin: SK
region: Slovakia
---

# 125 GPH water flow & aeration 3-stage filtration system Universal in-tank clip mount Tetra Whisper 135 GPH Internal Power Filter For Aquariums | For Fish Tanks Up To 30 Gallons, Whisper Quiet, 3-Stage Filtration, Space-Saving Internal Filter Clips on Tank

**Brand:** tetra
**Price:** € 77.04
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your aquarium game with whisper-quiet, powerhouse filtration!

## Quick Answers

- **What is this?** Tetra Whisper 135 GPH Internal Power Filter For Aquariums | For Fish Tanks Up To 30 Gallons, Whisper Quiet, 3-Stage Filtration, Space-Saving Internal Filter Clips on Tank by tetra
- **How much does it cost?** € 77.04 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/13425518-tetra-whisper-135-gph-internal-power-filter-for-aquariums-fish)

## Best For

- tetra enthusiasts

## Why This Product

- Trusted tetra brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Space-Savvy Design:** Mounts inside the tank allowing flush placement against walls—maximize your desk or living space aesthetics.
- • **Powerful & Efficient:** Air-driven filtration pumps up to 125 gallons per hour, oxygenating water for vibrant, thriving aquatic life.
- • **Effortless Maintenance:** Large Bio-Bag cartridges make filter changes quick and mess-free—because your time is valuable.
- • **Optimized Water Quality:** Dual-sided dense mesh traps debris and fish waste, keeping your aquatic environment pristine and healthy.
- • **Whisper-Quiet Operation:** Submerged motor design ensures near-silent filtration, perfect for peaceful office or home aquariums.

## Overview

The Tetra Whisper Internal Power Filter is a compact, in-tank filtration system designed for aquariums between 10-30 gallons. Featuring a 3-stage filtration process with large Bio-Bag cartridges, it delivers up to 125 gallons per hour of air-driven water flow while oxygenating the tank. Its universal clip mount allows discreet installation inside the aquarium, enabling tanks to sit flush against walls. Known for its whisper-quiet operation and easy maintenance, this filter ensures a clean, healthy aquatic environment with minimal effort.

## Description

For the ultimate in convenience and quiet, choose a Whisper In-Tank Filter. These filters mount on the inside of the aquarium, rather than hanging from the outside -- making it possible to place the tank flush against a wall. In-Tank Filters are unusually quiet, since the motor is under the water. Offering the same quality and performance as an external filter, the Whisper In-Tank Filter will function in as little as 2 inches of water -- making it ideal for turtle tanks, or for creating a waterfall inside the tank.The Whisper In-Tank filter features adjusts easily to high or low water levels with mounting suction cups and/or bracket. Each filter comes with one pre-assembled Whisper Bio-Bag filter cartridge.

Review: Love, Love This Filter! - Okay so... I have a 20 gallon temporarily for my 4 inch turtle. I accidentally bought the smallest of this tetra filter, so I bought the medium sized one in it's place. I had only had the tank filled halfway anyway since my turtle was only 1.5 inches at this point. Mind you I didn't realize how fast they grow, and had no idea that Its recommended to have a filter that can filter 2 to 3x the tank size. So I decided to keep both filters in my tank. One on each side. Even though I still don't reach the recommended filter size, my water now almost filled to the top, stays absolutely clean. Turtles are pretty messy so I still have to do the weekly cleanings and all that extra stuff that apparently those who spend hundreds of dollars on filters still have to do as well. I don't know if this is some kind of luck thing, I don't know if maybe my turtle just isn't that dirty (yea right, I see him)... but I'm actually not looking forward to switching out my filter for the 'recommended' filter size, as these filters work so good. I love them. They are both very quiet. Aside from the sound of the water falling back in.. I mean it sounds like a waterfall. Who doesn't want to hear a waterfall? I love it. This can also be prevented by raising the water level or lowering the filter itself. Basically the closer it is to the water, the quieter it is. Such a simple device, yet so beautifully sufficient. The little one stopped working at one point and I thought... welp there you go! Get what you pay for. But nope! Removed the base, pulled out the magnetic spring propeller and tube, cleaned it out and like magic it started right up as soon as I plugged it back in. Love how easy it is to replace the filters. The filters themselves are great and definitely hold on to some dirtiness. One thing I'll say is there is quite a bit of unused empty space. I now take advantage by adding some extra media, but I must say that these filters work great even without the extra. Love this filter and would recommend above any other filter.
Review: 👍🏼 - This fish tank filter has been a solid addition to my aquarium setup. It keeps the water clear and clean, and I’ve noticed a big improvement in overall water quality since using it. It runs consistently without much maintenance and helps maintain a healthy environment for the fish. It’s easy to set up and doesn’t require anything complicated to get started. The flow is steady and helps with circulation without being too strong for the tank. Cleaning it is simple as well, which makes routine maintenance much easier. Overall, it’s a reliable, effective filter that does its job well and helps keep the tank balanced and healthy with minimal effort.

## Features

- UNIVERSAL DESIGN: Tetra Whisper 20i Internal Filter is an all-in-one air pump and water filter system.
- INTERNAL FILTER: Mounts on the inside of your aquarium with clip (included).
- CATCHES DEBRIS: Dense, dual-sided mesh filters debris and fish waste.
- AERATES WATER: Air-driven design filters up to 125 GPH while oxygenating water.
- CONVENIENT DESIGN: Uses large easy to change Bio-Bag cartridges; filter mounts inside aquarium, making it possible to place tank flush against the wall.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002DHYG8 |
| Best Sellers Rank | #1,344 in Pet Supplies ( See Top 100 in Pet Supplies ) #1 in Aquarium Filters |
| Brand | Tetra |
| Brand Name | Tetra |
| Capacity | 30 Gallons |
| Container Type | In-Tank |
| Customer Reviews | 4.3 out of 5 stars 22,287 Reviews |
| Global Trade Identification Number | 00046798258179 |
| Included Components | Aquaria 75025817: Tetra Whisper 20I Internal Filter |
| Item Type Name | Aquarium Filter |
| Item Weight | 1.5 Pounds |
| Manufacturer | Tetra |
| Material | 100% Polyester |
| Material Type | 100% Polyester |
| Model Name | Whisper Internal Filter |
| Model Number | 25817 |
| Package Information | In-Tank |
| Part Number | AQ-65817 |
| Power Source | Air Powered |
| Purification Method | Ultra Filtration |
| Smart Home Compatibility | Not Smart Home Compatible |
| UPC | 046798258179 |
| Unit Count | 1 Count |
| Warranty Description | See label |

## Product Details

- **Brand:** Tetra
- **Global Trade Identification Number:** 00046798258179
- **Included Components:** Aquaria 75025817: Tetra Whisper 20I Internal Filter
- **Item Weight:** 1.45 Pounds
- **Manufacturer:** Tetra
- **Material:** 100% Polyester
- **Model Name:** Whisper Internal Filter
- **UPC:** 046798258179

## Images

![Tetra Whisper 135 GPH Internal Power Filter For Aquariums | For Fish Tanks Up To 30 Gallons, Whisper Quiet, 3-Stage Filtration, Space-Saving Internal Filter Clips on Tank - Image 1](https://m.media-amazon.com/images/I/81g1VKwt4dL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: What size replacement filter cartridge for this unit...small, med?**
A: The Tetra Bio-Bag Large (formerly known as Regular) are the exact same as the filter bag supplied with the Tetra Whisper In-Tank filter 20i. I got both from Amazon: filter $11.89; 12 cartridges $12.28. These filters last a long time, can be cleaned and reused. For my purpose, this filter has been great.

**Q: Where can I just get the Bioscrubber?**
A: Hello. You can get it at a pet store, amazon has some, grocery stores with a pet section...they are pretty easy to find.

**Q: Would a small fish get sucked up in this filter? I have a 2 month old beta who is just recently getting color fins but still very small**
A: Yes. I had 4 neon tetras and all 4 ended up getting sucked into the filter and the spinning fan mechanism blended them into multiple pieces. It happened the first night, I woke up and 4 fish were missing. I found them in the filter :(

**Q: Would this filter be too strong for a Betta in a 10 gallon tank?**
A: Yes, it would be fine.  It is rated at 90 GPH which is the appropriate flow rate for a 10 gallon tank.  Bettas are not the strongest swimmers, it is true, but typically handle filtration fine, as long as it is placed at one end of the tank so they have room to move away if necessary. They eventually adapt and will often play in the flowing water.  Initially, you might want to place tall plants or tall décor in front of it to break up the flow until the betta becomes accustomed to it.  For additional assistance, please call the Tetra Consumer Relations Team at 1-800-526-0650.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Love, Love This Filter!
*by T***R on September 29, 2023*

Okay so... I have a 20 gallon temporarily for my 4 inch turtle. I accidentally bought the smallest of this tetra filter, so I bought the medium sized one in it's place. I had only had the tank filled halfway anyway since my turtle was only 1.5 inches at this point. Mind you I didn't realize how fast they grow, and had no idea that Its recommended to have a filter that can filter 2 to 3x the tank size. So I decided to keep both filters in my tank. One on each side. Even though I still don't reach the recommended filter size, my water now almost filled to the top, stays absolutely clean. Turtles are pretty messy so I still have to do the weekly cleanings and all that extra stuff that apparently those who spend hundreds of dollars on filters still have to do as well. I don't know if this is some kind of luck thing, I don't know if maybe my turtle just isn't that dirty (yea right, I see him)... but I'm actually not looking forward to switching out my filter for the 'recommended' filter size, as these filters work so good. I love them. They are both very quiet. Aside from the sound of the water falling back in.. I mean it sounds like a waterfall. Who doesn't want to hear a waterfall? I love it. This can also be prevented by raising the water level or lowering the filter itself. Basically the closer it is to the water, the quieter it is. Such a simple device, yet so beautifully sufficient. The little one stopped working at one point and I thought... welp there you go! Get what you pay for. But nope! Removed the base, pulled out the magnetic spring propeller and tube, cleaned it out and like magic it started right up as soon as I plugged it back in. Love how easy it is to replace the filters. The filters themselves are great and definitely hold on to some dirtiness. One thing I'll say is there is quite a bit of unused empty space. I now take advantage by adding some extra media, but I must say that these filters work great even without the extra. Love this filter and would recommend above any other filter.

### ⭐⭐⭐⭐⭐ 👍🏼
*by J***E on April 29, 2026*

This fish tank filter has been a solid addition to my aquarium setup. It keeps the water clear and clean, and I’ve noticed a big improvement in overall water quality since using it. It runs consistently without much maintenance and helps maintain a healthy environment for the fish. It’s easy to set up and doesn’t require anything complicated to get started. The flow is steady and helps with circulation without being too strong for the tank. Cleaning it is simple as well, which makes routine maintenance much easier. Overall, it’s a reliable, effective filter that does its job well and helps keep the tank balanced and healthy with minimal effort.

### ⭐⭐⭐⭐ Big improvement
*by E***G on February 5, 2026*

Big Improvement over the previous model. My small tank came with the previous version of this filter and it has a quite significant design flaw that twice caused the unattended tank to lose almost half it's water. Essentially, if the filter was at all clogged with particulate, water pressure would cause the water level in the filter to rise to the point it would flow out of the tank on the clip holding the filter to the edge of the tank. After the second time this happened and a lot of luck that it didn't fry my power strip, I decided it was time to switch filters. While I was prepared to move totally away from Tetra due to my upset over the previous situation, I noticed while researching the change in holding clip. The new design obviously is in reaction to the problem I encountered as it now is architected that even if water were to move back onto the holding clip, it would drain down into the tank as the attackment to the wall is lower on the body. Since I pretty much liked everything else about the design, I decided to give the new version a try. Price-wise it was reasonable and the noise level is very low. Once I received it, it was easy to assemble. My one complaint would be that the box contained two suction cups, but there is no instruction on how they are to be used. That said, I was able to position the filter very easily and the updated design allows it to be placed in such a way that it doesnt interfere with the tank cover. That had been a big complaint I had about the previous design. It was very quick to assemble, get in place, and start using and the speed of the water flow seems appropriate for the smaller tank size. Cleaning is easy since it essentially is just replacing the filter periodically. They do recommend on a yearly basis cleaning the impeller, which should help it last longer.

## Frequently Bought Together

- Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump
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- Tetra Whisper Easy to Use Air Pump for Aquariums (Non-UL)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-07-31*