Hello again, back about my barbs :,) I recently had a female lose a fin. In several hours it was completely gone. No nipping, I believe it was Columnaris. Moved her and my male barb to a hospital tank, treated them for 2 weeks and finally added them back once my female started showing new growth on her tail and active improvement (eating again, producing waste, swimming a lot, etc) I was intrigued by the idea of her entire tail growing back, but since I’ve never seen this in another fish I’m not quite sure what’s happening. I saw tiny rods that form the structure of the fin start to grow, and now suddenly it looks very different?? Is this new flesh growing in at the base of the tail, or infection? I can’t possibly imagine this being another infection, considering I treated with products that kill fungus, and no one else in my tank has shown any odd symptoms.