They have these clear barely visible strands on their back tail fin. I don't notice them anywhere else on them. I don't notice anything differently about their fins, I don't see any white spots on them, they shimmy and swim vertically. The one female who had it had 1/3rd of her tail fin disappear mysteriously. The patches on the pleco look almost dusty grey or white. He has them on his tummy and his back. It also looks like hes got a black spot on his back i never noticed. I am not sure what is going on and I am not having much luck with online research either. I hope there is someone out there who knows what is going on