You might be adding to much air to the tank. I have a trickle of one bubble per second straight from the airline. That is what I told is good enough for the tank and has worked for me.No its just an air powered sponge filter. Basically a sponge with a bubbler. And feeding 1 species of phyto is not ideal because it's not a complete diet but I am feeding multiple species with the phyto feast. Maybe something in my Nanochloropsis contaminated something but I'm not sure. I might switch to spirulina but I want to at least try to finish the bottle of phyto feast first, I haven't used much of it and I don't see any reason why the phyto feast would be an issue.
Stability is just bottled beneficial bacteria so I can't see that being the problem. I need to check the ammonia to make sure that isnt high.
Thanks for the suggestions.