It can be a colony of, pshhhhhh, lets say uh?? Frontosa!! But only one species of Frontosa. But a tank full of Red Arow's would be better. Too bad I don't have a tank large enough for them, or even the fish it's self. Some where in here I said I wanted Front's but my 90 isn't large enough for them so I picked my 3 Blue Jack's.