Red Sea Fish Pharm ARE22204 NO3:PO4-X Biological Nitrate and Phosphate Reducer for Aquarium, 1-Liter

Works for the most part, but should not be used as a long-term application in smaller aquariums. Also, with the use of nopox ensure to dose coral foods as it will eliminate some of their zooxanthellae.

I've been using this stuff for about 2.5 years now, dosing every day with very few exceptions. I'll admit this stuff is a little pricey, but I do believe it works. The theory here is that you're dosing short hydrocarbons (think ethanol/methanol/acetone) that the bacteria in your tank are able to combine with the nitrogen and phosphorus present in your tank (in the form of nitrate/nitrite/phosphate) and use to reproduce. As a result, you end up with less nitrate and phosphate in your water, but at the cost of an increased bacterial population. As a consequence of this additional bacterial load, (heavy) skimming is essential. If you use this product without a skimmer, those extra bacteria eventually die and break down and you're left with the same problem you started with. That being said, don't use this product in your tank unless you're running a skimmer.Pros:1. Effectively reduces phosphate and nitrate concentration in your water when used in conjunction with a good skimmer.2. Corals seem to react positively to increased water quality by displaying better color and faster growth.3. I feel more comfortable with a slightly increased bioload and feeding a little more because I know the NO3-PO4-X is designed to manage that increased waste.Cons:1. It is a little expensive, but I believe you get what you pay for.Overall, this is a great product I would definitely recommend to others with reef tanks.

This product took my levels down quickly & safely. You may get cloudiness after use, that was normal. No issues or fish loss!

I was having issues with water parameters in a 75 gallon saltwater fish tank I had just bought from a co-worker and needed to get them in check since there was already fish in the tank, so I bought this. This bottle is huge, and very little of it is needed to bring phosphate levels down, so this will last you for quite a while and would be useful in automatic setups with the included nozzle cap to hook up to tubing. Make sure to follow the instructions that are listed on the bottle and don't use this product before or after just feeding your fish.

Granted DIY solution is cheaper but this works. Gets my nitrates where I want them and lowers phosphates although other means needed to get that solved. However, I'm not testing just using this and will update this review if it also manages my phosphates. Did when I first started using it a year ago.