So I'm still new to fishkeeping and I'm not sure if my fish have fin rot or if they've just been nipping at each other. I've read that fit rot usually has a black outline around it but the fish in question are black phantom tetra which makes thr black outline criteria kind of useless. The only discoloration in the areas is a white kind of clear color. When fins grow back do they grow back clear before the coloration becomes in? Most of the missing tissue on the fish are on the lower tip of the tail and at the bottom of the umm big bottom fin. Sorry I don't know fish anatomy. Is this a common nipping area?