My tank is 110 gallons. I've got 2 angelfish, 3 silver dollars, 1 firemouth, 1 female convict, and 2 severums. (1 green and 1 gold) Their all around the same size. The fish are fine except the green severum likes to chase the gold 1 around. Theirs plenty of hiding spaces and I added them at the same time? The gold isn't damaged of anything. Its healthy but I just wasn't sure what was going on lol. 1st time keeping severums