My rats have these sand colored bugs on them. They have spread from one of my rats to all of them. We tried regular bathing them, and pulling them off. We have isolated the rats that have the bugs outside, and cleaned cages and bathed our other animals (the cats and piggy and rats). This just started about 36 hours ago. The one rat who initially had them died he was very weak and nothing we did helped him. We aren't sure what the rats have, if its lice mites or fleas. It made the rat weak like mites, but they look like lice, but there is dander like fleas. What is it? And is there an over the counter "revolution" dip (if thats what I need) that would work? (I'm a bit poor to be spending a lot). I just need any and all information I can get.