Betta not eating

[Valkyrie]

My friend has a betta that has lately been refusing to eat. He used to have it in a tank that was way too cold and shifted temperatures a lot, but has switched it into a heated tank with a steady, warm temperature. The only thing stressing it out now is the cat because he keeps forgetting to put the lid back on the tank; so far he has caught it trying to catch the betta twice. The betta still isn't interested in its food, though; he tries to eat a piece only to spit it back out and quit trying. I suggested feeding it bloodworms, but he only ate one. It's been five days since he's eaten anything.

Any suggestions on how to get this betta to eat?

 

[wuvmybetta]

Perhaps turn his heater down a tad? what is it at?
I've found that generally they prefer to be cooler than warmer (not cold! but around 76-78'ish)