Hi all, It would appear one of my green spotted puffers has a tail fin issue. It's not rotting at the edges at all. There seems to be fungus or a film covering from his body edge to half way to the edge of the tail. Just that area. What could this be? Could he have been bit by the other puffer at the base of the tail and it's fungus covering the wound? His dorsal fin however does seem like a bit of fin rot. All other fins are fine. He was recently stressed being a tank that was unsuited for him. He had nearly stopped eating and was lethargic. Since last week I've upgraded his tank and bought a proper heater and ensured the water levels were all set to go. He's a happy little fish again! Totally being the greedy energetic munchkin I knew him to be What is the issue with his tail though? I'm worried it's a much bigger problem. Help please and thank you.