Thanks Eric!
I have a new small batch of RES in my 75 gallon aquarium that I am pellet training just for fun, I'll toss an occasional cricket in the feed ring and it is "gone in .6 seconds".

I still haven't figured out what exactly it is about AM500 they don't like, might be taste, texture, or both, but half of them have figured out that AM500 is better than going hungry. I watched my largest RES (5") eat ten AM500 pellets in a few minutes two weeks ago, once they figure it out they seem to be OK with pellets.