I have 4 oscars in ~450gal. Average size would be around 9 inches and at this point im getting away with 20% water changes fortnightly. This keeps my nitrates under 20ppm. Obviously the larger they get, the larger/more frequent my water changes will have to be.
Just some food for thought.
Sent from my GT-I9305 using MonsterAquariaNetwork App
Just some food for thought.
Sent from my GT-I9305 using MonsterAquariaNetwork App