I have some hunches about mine. It didn't look all that great in the store. So they gave it too me for almost half off. I didn't realize it had two mouths until I got it home. Dunno if it was trying to split and couldn't for some reason or not. Been looking around around and see that people are suggesting 0 nitrates and 0 phosphate. So will give that a try. I've heard that some is needed for photosynthesis. But others say nope go with 0 so I may try setting up bio balls to strip them out before I try another nem. Also trying to get a definitive answer about temperature. Some say that 78 is proper others same warmer is better. Randy Holmes said he keeps his tank at 80 so I'm inclined to keep mine at that. Dunno. I'll change a few things after those have stabilized I'll get another nem and see what happens with that. Eventually I'll figure out a combination that works.