Keep an eye on your son's maroons...they generally don't get along well with each other. We started our tank with a pair and within a few months, the smaller of the pair had ceased to be, took a ride on the porcelain express, was swimmin' with the fishes. I don't know why but they just don't like each other (unless you got a mated pair....very expensive and rare to find available)....just a word of caution!