Nothing yet, though I seriously doubt they'll live unless some of the fish you had before have died. What's your stocking at right now?
The fish sold as
Peltobagrus ornatus is more than likely
Hyalobagrus flavus as mentioned before. Common name for them is Shadow Catfish. They will stay small, so you're lucky there. How many of them did you get? You'll need a shoal of at least 4, preferable 5. In your 15G, this means that if you did indeed get those harlequins as well, you're absolutely fully stocked. Then again, we've told you this a lot of times already, and you have yet to listen to it.
Rather than posting all info here, you can read it yourself on this website (url completely typed out for you, seeing as you can't ever seem to get it working if it's not):
http/www.planetcatfish.com/catelog/bagri...lobag/295_f.php
Next time, look at the fish you think is pretty, write down the name, go home and research them first, and only then go back to the shop to actually buy them. If you're worried about them selling when they're gone, ask the person in the shop to hold them back for you and say you'll give them a ring before the end of the day to let them know whether you can house them or not.