Actually the aeration idea came up to help ease your fish breathing oxygen while he was in a delicate situation. Active top dweller in a 5'x3' footprint? How about a red tail giant gourami? Oh, that one's not active???...I cannot think of any top dwelling fish other than an arowana? How about you get datnoids?
I have a giant gourami in there already hes my main/show fish. hes only around 11" right now. I also have a 3" datnoid that refuses to eat anything other than shrimp and has grown maybe an inch and a half since I got it in july. I have always loved Arowana's but I feel that 5' length would not be good enough for one, which is a shame cause when I got an amazing deal on this tank I originally thought "YES I could maybe get an Aro now"
Thanks for the kind words everyone, the chalceus I had was very active and ate loads at feeding time, it lived up to all my expectations. it grew pretty fast too, it went from 4" to 8" like that and put on some considerable thickness before dying
