injektion
Fish Fanatic
Cherub angels would be good in a 30 gallon. I used to have one in my 30 until I upgraded to a 70 gallon. They are not shy at all, in fact they may be the most aggressive fish you'd want to introduce. They really only go after fish that resemble their shape though. Also try to introduce it as the last fish so that any other fish you have will have claimed their territories already. They swim around a lot, usually grazing on rocks, the substrate, and the glass, looking for food. They really only hide when it's lights out so that they're protected in their sleep.