Aptasia

[BCOrchidGuy]

Well, for starters lets address what is making them grow so fast, I'd say you are probably WAY over feeding, cut way back on the food. Copper is not the way to go unless you want to toss all your live rock and buy a new tank, the copper will stay in the silicone and leach out slowly so the tank will not be suitable for corals ever.
There are two shrimp commonly sold as peppermint, one is a true peppermint, the other isn't, don't remember which is which, I bought 4 peppermints from J&L and put two in my 60 and two in my 10 gallon tank, I only had a couple aptasia in each but the peppermint shrimp ate them all right away. If you decide to go with a copper band perhaps you should consider not feeding it, I've never tried a copper band so I don't know how likely it will eat them out of hunger.

Doug