I got a new super delta betta fish. He's pretty cool, white body and blue tail (used to be white with blue splotches, but now mostly blue).
I've noticed red tips on his caudal fin, which I believe is fin rot. It doesnt loot at all frayed either. I also noticed that his left pectoral fin was turning black, or is black, apart from the transparent parts - his right is blue. Pelvic fins also have black staining - not on tips.
I put him in a new fluval tank with fresh water that has been treated and being filtered. No heater at the moment.
With no fraying or holes, and a very gradual change, I wasn't sure what it is. I can try to get some pictures, but he wont keep still. Rather jumpy fellow. I'll post them below when I can get a good one in.