Well, I fed the Corys last night and I put the indignant Tango into a cup and floated him while they ate. He willingly went into the cup THIS time but I imagine any betta who can learn to be a catfish will also learn that going into his cup means no pellets for him. Darn smart fishy.
He's completely stopped laying on the heater bracket and is as active as ever. I'm hoping that overeating is his deal. The fatty!