I have a 36 gallon freshwater aquarium started a year ago with 6 glofish, 1 3” gold gourami, 1 2” catfish algae eater and now down to 4 from 6 guppies.
Filter type marineland Bio-wheel penguin 200
Current water parameters are:
Temp 78-80
Ammonia 0
Nitrate 20 (how could it possibly be if no...