Thanks everyone, currently I have a Jardini Arowana, 4 stingray pups, 3 flagtail Prochilodus, 2 ID sharks, a baby red tail. Still lots of space while I work on my 720. For filtration I built a 55 gallon sump with about 20 gallons of bio balls and 10 lbs of ceramic rings. I also have a 5 stage...