I have a 125 gallon with 2 Oscar's 2 Jack Dempsey 2 convicts and a common pleco. I have 6 pots of pathos roots in the top of the tank and 2 very large pots in the sump, tank has been running almost a year now and I've only changed water once, highest my nitrates ever were was a few months after adding plant's and fish 10 ppm that's when I changed water about 50%, since then the highest they've got up to was about 5 ppm and most recently 0. I do about a 5 gallon top off per week and that's it.

