FBT stopped eating

[FBTmom]

Hi Jace.
The rubbermaid bucket is blue, so he can't see out. But I didn't put a lid on it because it would be totally dark in there. Should I use something else, or is dark ok?
He was only in cooler water (70 degrees) for a few weeks tops before I got the heater. Now the water has been 78 for just over a month. I try feeding him every few days, sometimes in the bin, sometimes in his tank. He only has one tank mate (who eats fine) so I'm able to monitor his food. I can guarantee he hasn't eaten a thing, unless he's eating the frog moss off the ground. He was quite obese prior to this, so maybe he's been living off his own fat? I don't know, but he definately doesn't act like a starving, sick toad.
I can try the warm bath prior to feeding and see if that helps, and if the bin I'm using isn't good I can find something else to use.
I'm posting a pic of him that I took just around the time he stopped eating. It's not the greatest as far as showing how fat he was, but it's the most recent and does show his plumpness. His belly would flop and spread out under him when he 'sat'. My avatar is also the same toad. I'll try to get a new updated pic of him and post it.
Another things that's odd is since the heater went in, the toads spend very little time in the water, where as before they were in there 99% of the time. Yes, the water is treated.
Thanks!