That is very interesting to know about dealing with a very young betta. I'll store that info away in my mental cheek for later.

And yeah, it is appealing, that's probably why they do it. BTW, I caught Rusty not merely grabbing a shrimp pellet first but actually grabbing it with his mouth and stealing off with it, as if to deny it to the corys, which were still rooting around for it. However they are too big for his mouth so it inevitably fell out...if they could only get past that opposable thumb thing they could rule the world, hey?