Will this break down into mush after a year or two like other planted tank substrates?

I have multiple tanks where I've used potting soil that have been up 2 years. I've never used ferts either. Skip this junk and go true soil.

how long does it take for it to buffer the pH in the tank?

I purchased Fluval Stratum from a local pet store, who recommended it because of my tap water's parameters: 7.8 PH, 150 GH, and 180 KH. I added this substrate to my new tank in the evening. The next morning my PH was 6.2, maybe even lower. My test strips only go down to 6.2 PH. My GH 0, and KH 0. I have been testing the water for the past week and PH is 6.8 one day and back down to 6.2 the next. GH bounces between 0 and 25, and KH bounces between 0 and 40. I did an 80% water change two evenings ago but the next day, the water dropped back down to PH 6.2, GH 0, KH 0. This substrate was so expensive, that I hesitate to remove it and start over, but I will if water changes don't remedy the situation. Glad my fish are still in my old tank or they would probably be dead. My situation seems drastically different from other people's experience. If you purchase Fluval Stratum, I would put it in a bucket with some of your water and test it for a few days, before putting it in your tank and getting your tank all set up and planted.

I have a hard time keeping shrimp, will this help?

It's a good substrate for shrimp

Will hard decorations or rocks on top of this substrate crush it?

Not at all with my experience its the best substrate I ever use my plants look so healthy when I used it I definitely recommend it

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🌿 Elevate your aquarium’s ecosystem with nature’s powerhouse substrate!

SHRIMP SAFE HAVEN - Provides essential shelter for newborn shrimp, boosting survival rates and biodiversity
CRYSTAL CLEAR WATERS - Prevents discoloration and manages organic waste, keeping your aquarium pristine and Instagram-ready
MICROBIAL POWERHOUSE - Porous texture accelerates beneficial bacteria colonization, ensuring a balanced ecosystem
OPTIMAL P H STABILITY - Engineered to maintain ideal neutral to slightly acidic water conditions for diverse freshwater species
ROOT FRIENDLY VOLCANIC SOIL - Lightweight yet nutrient-dense substrate for thriving aquatic plants

Fluval12695 Plant and Shrimp Stratum is a 17.6 lbs volcanic soil substrate designed to promote vigorous plant growth and maintain a neutral to slightly acidic pH ideal for freshwater aquariums. Its porous structure supports beneficial nitrifying bacteria and offers shelter for newborn shrimp, while preserving water clarity by preventing discoloration. Perfect for professional aquarists seeking a healthy, vibrant planted tank environment.

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€ 330.44

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Brand	Fluval
Model Number	12695
Color	Stratum
Product Dimensions	30.48 x 11.43 x 48.26 cm; 8.07 kg
Material	Volcanic Soil
Special Features	Leichtgewicht
Item Weight	8.07 Kilograms

Fluval12695 Plant and Shrimp Stratum for Freshwater Fish Tanks, 17.6 lbs. – Aquarium Substrate for Strong Plant Growth, Supports Neutral to Slightly Acidic pH

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