I have a tribal Blenny. A couple months ago he looked as if he was starving. Very skinny and face area was sunken in. I was feeding a mix of brine and mysis. I added in tropical flakes and red algae sheets. I also treated with “prazipro”. The blenny has gained weight back and looks healthy weight wise however his tail has turned a white color. It seems to be moving up the tail very slowly. It doesn’t appear that the fin is damaged in anyway. I have researched and can’t find anything on this. I’m pretty sure it’s not normal though as he didn’t look this way before. If anyone has any information or advice it would be greatly appreciated. If you need more info let me know I will post it. Thank you in advance