I have never ket a long nosed and a coperband in the same tank together. There might be issues but i really dnt know on that one.
As for copperbands... They are difficult to feed, make sure you see it feeding at your lfs, if not then i would not even bother.
If the fish seems a little reluctant to feed when its in your system then take a couple of mussel shells and glue them together. drill a small hole in one of th eshells and put the food inside. the copperband will use its longer nose to feed as this is more natural for it. Seems to work quite well from the people i have kow who have tried keeping them.
To be honest though, a copperband is not a beginners fish, they ned a very stable tank with mature conditions. I would gain some experience with the more hardy fish first then use that experience on something more difficult later on.