If I were you I would go to different fish stores and find a male red devil or male midas or male flowerhorn. They need to be around 4" or bigger, and make sure the fish is attacking you through the glass, in that way you have more chance of getting one that is a glass banger from the start.
Trust me, Ive got a male midas(red devil) in my 75gallon in bedroom and it was a glass banger from day one at 4" size and now 8" it will jump out of the water to bite me and litterary and yank/bite the nylon end of my fish net all over the tank, like a pit bull yanking a piece or rope. Very mean and owner responsive.
Another option is get a bunch or african cichlids w/ rocks and bubbles they are pretty cool also for a show tank type.
Either way you cant go wrong.
Goodluck.