What's you pH? It may be a little on the high side for a CTs fins. Driftwood and/or IAL or Oak leaves might naturally lower it enough to straighten his fins. Of course then you have tea-colored tannins in the water. Some people like that. I don't much.
thanks =) do you know why his fins still curl? it looks like they are uncurling a bit but some just don't want to straighten out. x_x
oh no problem, I thought you would delete it. =) I would too. hahaha!