About a week and a half ago I inherited a male betta from a relative who didn't want it anymore. Full disclosure - I don't really have any recent experience with fish, aside from when I was a teenager 10+ years ago.
Anyway, she gave it to me in a tiny 1g tank with no light and no heater. I suspect she wasn't very diligent with water changes. I immediately went out and bought a 5g tank kit along with an immersible heater, Seachem Prime and Stability, and an API Water Test Kit. I've spent the last 5 days getting the tank ready - cycling and whatnot. In the interim, I've done 50% water changes on the old tank just to be safe. I finally moved it him over yesterday, and to be honest, this was the first time that I actually got a really good look at him (the tank kit has 16 LEDs - pretty bright!). I'm concerned because he appears unhealthy. His tail looks pretty ragged, and he has some grey coloration on the head - which I don't believe is natural.
I've attached pictures below. Full size images at: http://imageshack.us/g/861/img0987c.jpg/
Any help is appreciated!