I would suggest peppermints, however they are hit or miss.
Copperbands can be finicky and IMO are not a real good fish for LFS's to be stocking since they can be very finicky about eating prepared diets.
It took about 4 weeks before I noticed my peps made a dent in my 40 gallons aiptasia population, but a week after that it was all gone.
The CBB I tried in my 55 before that ate all the feather dusters before touching the aiptasia, he cleared out the aiptasia next, then I couldn't get him to eat anything.
My suggestion is to get about 4 or 5 peps acclimate and et em loose. Don't feed your tank as much, because they are great scavengers and you want them to be hungry.
Give em about a month and a half and see if you notice fewer aiptasia. I think it's important to not feed as much after you introduce them, make them eat the aiptasia first