I have had several different setups in the tank. I have had a fully blown pleco tank with 20 plecos in the tank, ranging from 12"-5"; a carnivore tank with 5 aros at 12", a royal knife at 12", ornate bichir 8", and 8 plecos; now I have a community, with 20 diamond side tetra, ~20 assorted other tetras, rainbowfish, 4 plecos, 2 whiptails, 5 RTBS 4-5", 4 whitefin sharks 3-4", 1 rainbow shark 5", 3 cories, 13 otos, 14 checker barbs. All of these tank setups have yielded similar results. My carnivore tank actually had a problem with too little nitrate. I would have to dose 1 1/2 tsp nitrate daily just to maintain a 10ppm nitrate level.