Mr. Limpet
Aquarium Advice Addict
Ok that's not good. If it is velvet, it would have most likely started at the head. To be sure, do you see the copper color on his head/gill area?
The ghosts and cards are fine at 80. But if it is velvet, the temp should be raised high enough that it may not be great for them. I would start bumping the heat right away, 1 degree every 12 hours. Is a hospital tank avail for the betta?
Nope. His head, gills look fine. The dark coloring is on his long front fins that are two-tone blue/brown from base to tip (same pattern he's always had), only lighting them up (my flashlights pretty strong) it looks kinda copper colored. But no dust coating.
If it's velvet, shouldn't I treat the whole tank with Quick Cure? If it's not and I treat it, will it harm them?