My son came home with a blue spotted salamander he found. We have had it for 3 days, in an aquarium, set up the way the pet store told us to. We have crickets and have tried worms as well. He hasn't eaten yet. Today I had set him in the water dish in his cage for a little bit until he climbed out. A few hours later I walked by the aquarium and there are 2 long skinny "worm" like things moving around in it!! Is this normal and what can I do??