wow Meg you beat my tank for having more aiptasia, I did not think that was possible. Your tank is too small for a copper band and I recommend no one buys them, even with large tanks. they are too delicate for captivity, or ship very poorly. whichever the case way too many copperbands die due too the reef trade, I wish retailers would just stop selling them.
You could try a small Aurigia butterfly, you'll have to find it a new home once it grows up, the 55 is much too small for an adult.
Other than that I would consider starting over, that's an insane amount of aiptasia.