A while ago, one of my large males attacked a smaller gecko I have. He made a squealing sound and gargled at the mouth, and it really worried me, but since he's seemed alright enough. But one thing bothers me : His eyes get dialated at night and it seems like he stares off into space. The other geckos' eyes don't dialate as much as his, but other that he seems normal. Of course the male has been seperated from the larger cage, and none of the other geckos are having issues with each other now.