D7620;3464970; said:red devil?
flowerhorn?
A 3' tank is not a suitable home for either of these fish as adults...
I believe you would be much happier keeping a few smaller fish in your tank than one bigger fish...
There are a couple species of Geos you could pick one species of and keep a trio of...
You could keep a pair of Apistos & a pair of Rams... possibly even a small group of Bolivian Rams... along with a group of Tetras or the like...