lol, ya I hear that! It took me almost a week to find something Blue was "satisfied" eating everyday!
Well...look at feeding him the worms by hand as a good way to prevent over feeding ;D
Glad to hear he's getting more comfortable in his surroundings.
Another thing you could do since your now able to get him to eat from you...see about getting him to "touch" your finger for a worm. First start by coaxing him to surface with just one worm [like regular feeding], then just basically point at him over water.
If successful, he'll touch it [actually bites it, but mouth so small, it doesn't hurt...kinda fun and funny]. You can start easy with him by having finger on water surface, then advancing him by raising the finger 1/2 or more, and see if you can get him to jump!
Just another way to bond with him, nad become better "friends" lol [kinda like playing fetch with a dog ;D ]