Hi there! This is my first time posting here. I've searched the internet and thought I should probably ask the community because I'll have better luck and answers
Crush (aka Fat Fat) is about 17 years old (picture attached) and he has a 75 gallon tank with a Fluval FX4 canister filter. The filter is less than a month old and I did 1 partial water change (about 75%) on this last Friday (3 1/2 days ago) because the water was so green and becoming smelly. And it had only been about 2 1/2 weeks since I had put in the filter. I cannot keep the water clean. It's perpetually yellow/green and I'm not sure why Is the tank just too small for him (he's fed every other day) or is the filter not big enough? Or maybe I've not waited long enough for the filter to cycle? Help. Please. I beg you.