I had one that size and it grew pretty quick to about 6-7" before I gave him away. Some are less of a problem and if you feed it every day they might servive for awhile but they will be eaten at some point. Mine after I gave him away killed and ate part of a 5-6" tang and other very large fish.
I was feeding it 4" minows and it would swollow them as soon as they hit the water, sometimes jumping up to get them.
good luck