My betta Comet recently lost over half of his beautiful HM tail to fin rot. It's been growing back nicely, but now the regrowth growing black instead of his normal turquoise. The regrowth has turquoise rays, but the actual webbing looks black like he still has fin rot. If you shine a light through it though, the black parts are kind of clear and the edges are light so I don't think it's fin rot. Is it normal for a betta's tail to grow back much darker and is there a chance it will lighten back up?
Also, my betta's dorsal fin is spiked kind of like he is a CT. I'm not sure if it was always this way or if the fin rot made it like this since Comet got fin rot soon after I bought him. The dorsal fin is not growing back and it continues to stay spiked. Some of the bottom spikes are looking black, but they've been that way for a while and I don't think they are getting shorter either. Is this a sign that he still has fin rot or is it possible that his dorsal fin is naturally this way?