my flowerhorn is refusing to eat for a few days now. I don’t know what’s wrong. I only noticed towards the tail, it’s darker than usual. If u guys can gimme any pointers, very much appreciated. Thanks
More info below
Water quality:
PH 7.6
Ammonia 0
Nitrite 0
Nitrate 40 ppm (sink water test is same nitrate level)
Tank size:
65 gallon bottomless
Filter:
Fluval Fx5 canister