A very warm welcome to MASA Knuppel! You have a battle on your hands, mate. The problem I have found with Copperband Butterflies, is that they are firstly reasonably scarce (in LFS's), and secondly, when you do indeed get one from a LFS, you are NEVER guaranteed to know if the fish will ever eat. If you get one that eats, you are darned lucky that it does. IF it does not eat within 1 week of getting them, they usually end up dying in our tanks. :-(
Then, you have a possible chance of getting them from a fellow reefer - which, IF there copperband feeds, won't be easily convinced to let go of their CBB.
So - please be patient - you might get one, I dunno about two, but, it might take more patience than none.... :-(
Why, if I may ask, do you so urgently require TWO Copperband Butterflies? Is it perhaps because aptaisia is driving you nuts and killing off/irrititating you corals?
Thanks. Aiptasia overtaking is understatement. Had a previous issue and my then alive copperband cleared it and died before he could be caught and passed on. So one will be fine. I know they are difficult to come by and I am the most patient guy I know. Will wait. Will see.
Good luck to you mate. Perhaps you can let us know in which area you are? Perhaps a fellow reefer can help out - SOMEHOW?
BTW: I too had a TERRIBLE aptaisia investation in my tank - I rid at least 75% of the aptaisia, by removing my live rock where the aptaisia was on, and manually scrubbing the live rock completely with a nail brush (including the areas where the aptaisia was - as well as squirted vinegar directly ONTO the aptaisia)... Doing this over a 5 month period helped a HUGE lot!
You can always also try "Joe's Juice" in the interim, as well, while waiting for a CBB....
Welcome to the forum, have you tried true peppermint shrimp to get rid of the aips? better bet than the CB's you can't garrantee they will eat them anyway, many do, but equally many don't, but most die within a year of going in your tank.
You'll have to shop around at all of your local pet shops, however, make sure you buy the true peppermint shrimp and not a camelback shrimp, they look very very similar, so much so that often the pet shop will make a mistake in identifying it, familiarise yourself with the differences between the two before you go out and buy one.