Gill problems

Hi,

I hope someone can help me. I have just bought two small ryunkins which
looked fine in the shop, but once I had released them into their quarantine
tank, I noticed that one has gill plates that are slightly curled out at the
edges, and the other has one that could also be going this way. They seem
lively and otherwise healthy, but as I have only had them a few hours I
can't really say if they are acting normally.

Does anyone have any suggestions on what this could be? I have not treated
them yet, as I want to get the right medication. Any help would be
appreciated,

Thanks Kat