I've got a 75 gallon with 2 canister filters, can't remember the GPH but both are made for 100+ gallon aquariums. The largest female in the tank has been in there for about a year, it's an all mbuna tank. For the last 2 weeks she hasn't eaten much of anything at all. When I feed she usually stays in her cave and if she does come up she won't eat. She is the oldest fish in my tank, and was fully grown when I got her. She's not holding and has never been bullied, there's 2 male zebras in the tank with 9 females. She's never been a victim of fin nipping or anything of the sort and has always done whatever she pleases. She's not completely lethargic as she does spend time swimming and moving amongst the rocks but is getting extremely skinny. Ammonia and nitrite are 0, nitrate are 20 (aquarium is overstocked). There have been no new fish added in about 5-6 months.
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