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If all you want is to feed bacteria for some reason, using vodka/vinegar/sugar/glycerol is much cheaper option compared with glut, regardless of whether it is in fresh or saltwater. This is, however, normally not required in freshwater. In saltwater, this bacterial biomass is then exported by the skimmer, and since bacteria consume the phosphate and nitrate present in the system, these substances are thus removed from water - this is the main use of NOPOX and similar products. In freshwater, we do not use a skimmer, as it does not work efficiently, and this method for reducing nitrogen and phosphorus does not work there - if required, water changes are cheap and simple method to achieve that.Nope
I want to understand, does glutamate work in a freshwater aquarium the same way (feeding bacteria) as nopox does in a marine aquarium?
The main uses of glut in freshwater are as a method for eradication of unwanted algae, namely the stubborn black beard type algae, although many other types are also affected. The other use (and this was supposed as the main use when Seachem first introduced it in the hobby in its Flourish product) was as carbon source that can be utilized by the plants. It is argued whether it is utilized as CO2 after decomposition in water column, or if it can be directly utilized by penetrating into cellular issue - as this method seems more energy efficient for the plant rather than building carbonhydrates from CO2.
As Randy has already mentioned, I have never heard of anyone using glut in a reef tank environment. I personally had always wanted to try it out to check if it could have any useful effect (just because I had used it efficiently in FW tanks), but have never had the chance to test it so far.