Hi Flavia!
Thanks for your comments! We really enjoy having them, even if we hardly ever see them... LOL They're just such fascinating little creatures and sooo adorable! :-D
The only things they will eat right now are mealworms and beetles. We put them in a shallow ceramic dish along with some mulched greens and veggies. We've tried crickets (I maimed them by snapping the back legs to make it easier for the tribs to catch them), but they were left untouched. We also tried pupated mealworms but they won't eat those, either (I guess because they don't move -- but our chameleon loves them!).
I've been trying to set up a colony of wax worms but they keep dying on me! I haven't perfected the art of raising them yet. LOL I suspect it's because of where I buy them from. The worms are never very lively from the start.
We also keep hissing cochroaches and feed the nymphs to our chameleon. I thought of trying some on the tribs, but I'm so worried about the nymphs escaping into the appartment! Feeding them to the chameleon is not an issue, since we put the nymphs in a feeding dish with a rim of vaseline on the inside so they can't escape, and the chameleon just zaps the bugs with his tongue. But the tribs climb right into their feeding dish to eat, so there is always a risk that one or two bugs will get loose into the terrarium. Not a big deal when it comes to worms or beetles, but it is with roach nymphs because they can climb glass and plastic surfaces. *sigh*
Maybe I should just put a rim of vaseline on the inside of the tribs' terrarium. 
I hope they are getting enough nutrition with what we're feeding them. Even though the bug variety isn't great, they get a wide variety of veggies with the bugs (we also keep iguanas) and they inevitably end up eating some of the veggies along with. We prefer doing this rather than sprinkling the bugs with vitamin powder.
We ended up moving their terrarium last week from one room to another, and for the past week, their feeding has dropped. It's like they have to acclimate all over again. What sensitive little critters!
How are you liking your new tribs? Do you keep them all together? What do you feed them?
Julie and Justin 