I was admiring my daughter's 12 gal eclipse earlier today, when it dawned on me that she may have the most inappropriately stocked 12 gal tank I've ever seen. Before anyone jumps on me, keep in mind I'm in the business, so have limitless ability to move fish around. Any aggression or problems, or when the fish grow, rehoming them is not an issue.
She has a velvet damsel. Her first fish. Started maybe 1/2". Now easily 3" (size of a nice sized coral beauty angel).
3" clown trigger-I love the babies.
2" miniatus grouper. Awesome color on the juvies. Love to watch him dart around after food.
All doing great. No aggression at all. Really cool tank, IMO.
One day, I'll have the time to get some pictures.