She ended up getting her tail bitten to a nub (litterally to her skin) by the rowdy juvies so I separated her until her tail started to heal. Since she's a wag her tail is black, but it's growing in white and not getting it's color back. It's healed up half way so I put her back in with the other fish and so far I haven't seen any bite wounds. I'm not using any medicine, but I just want to know if it's normal for the tail not to get it's color back ever, or at least for a while.