Short answer would be one but my friend has a 24k and a super red together in a 200 and they seem to have plenty of room to move and live life. There around 18-20 inches by the way. I'm picking up a 220 tomorrow so I was wondering how many could I stock with them being happy. I know two is pushing it but having one aro in the tank all by it's self is boring to me. But that's just me whining lol, I will go for the fishes health and happiness first so is two too much for a 220? The size of the aro I get is 12-14 inches. Thanks.
