For future reference, you shouldn't have put the new ones into the tank with your "old" one without them having been quarantined first. If they have anything wrong with them you could have passed it to your "old" one.

Here's a picture of a male and female so you can figure out what you have...
http://www.reptilecare.com/leopardgender.htm

The two that were together in the store are probably "comfortable" with each others company while yours is the outsider. If there are two females and one male or three females, then hopefully all will work out and they will all get along.

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