Ya My Pacman is eating now! + diet question

[diabolique]

So Chibi Chibi ate his first 2 earthworms today after like 3 months of not eating. It was quite strange actually, when I came into the office after the long weekend (yes, i am allowed to keep him at work) He actually looked liked he was dead. He was kinda floating in the water (front legs splayed, not at all like his usual crouch) and his skin looked kinda waxy and his eyes were closed.

So i called "Chibi... Chibi.. into the cage and ate first nothing happened, and i thought "oh no, he's dead..." then he started doing the heavy breathing thing and i was totally relieved so I left him to it (sleeping, or whatever he was doing).

FFWD to Thursday, I come into work in the morning and there he is sitting on the rocks looking all perky and awake, like he hadn't been asleep for months. I was thrilled.

Friday i brought him some earthworms, and offered them to him with the feeding tongs, he immeadiately went for the worm. It took him about 5 minutes to eat the first worm, which was interesting because he can usually scarf down 6 in that amount of time. Then I feed him a second worm which he immeadiatley went for as well and that also took him 5 minutes to eat.

I left it at that since the guy hasn't eating in like 3 months at least and I didn't want to over do it. I will try again on monday.

I just had a dietary question. He only seems to like earthworms. Occassionally he will eat a pinkie like 2 a year, he will not touch crickets as far as i can tell, they all seem to drown or die weeks later. I have tried waxworms, mealworms and silk worms but the only thing he seems to like is earthworms. is this okay?

I use that calcimize stuff in his water and i change it once a week.
Once in a while he will go crazy and try and escape like 2 or 3 times a year but for the most part the most action he sees in heavy breathing and feeding time, unless he has some sort of secret life at night when the office is closed.

He has been off eating at least once before that i remember, for at least a month or two and he is probably 2 to 3 years old now.

Is there anything I can do to make his life more interesting or stimulating. I am concerned he is bored, bored of his cage and bored of eating earthworms...

thanks,

D