I apologize for resurrecting this thread, but the problem is still persisting. My fish is continuing to exhibit strange behaviors regarding food.
He acts hungry when I first get up in the morning. He has a little 'Im hungry feed me' swim pattern that he still carries out. But after the first pellet or two he seems to lose interest in eating and starts flaring out at both me and the food until I back away. I'm not sure what to make of that at all.
The bubble nest making has ceased since I presented the problem and I have engaged in more frequent water changes as suggested. And to clarify from before, the temperature is consistent and usually over 76.
As far as his activity goes, I'd say he's even more aggressive than before if his attitude towards me and food is any indication. If I make any moves near the tank he gets upset at me.
I have looked him over numerous times and I can't find a single thing different about him.
I'm more than certain he's getting enough food that starvation isn't an issue, but I continuously hear how any betta not interested in 'eating like a pig' is usually sick in some way. So the fact that he starts getting aggressive if I present more than what he wants is a little strange to me, especially since in the past he would eat and look for more food.