scotty
Fish Herder



cheers
scott
Honestly, I'd probably pick up a male. Explain to the shop that you may have to return it the next day depending on your fish at home.
If the fish end up lip-locking/squabbling whatever.. then you take it back and try a female.
The reason i'm suggesting to get a male is of course if you have 2 females you probably wouldn't know about it for a while, so by getting a male you may get a pair, or you may find out you need to take one back.