Thank you all for your suggestions! I am going to try the pond sticks again and I have gotten the iguana fruit pellets. I just moved them into a different enclosure, where the heat and the humidity seems to be better regulated than in their old one. They are actually moving around more and not hanging out in the same spot the whole time. Maybe this will help too!
I am trying out the Total Bites too. I will let you know how they work out!