I third the frontosa. Sometimes you can find a good deal on a breeding colony on aquabid, and I know at least in WA fry 1.5-2.5" easily sell for $25+
They would be Perfect in your 90
Always been a dream of mine... just got to get the money for a breeding colony first... I only have one little guy at the moment @5"...
And they are beautiful fun fish to keep!