I dont think he would attack anything that wasn't another anole or small enough to fit in his mouth. Try to imagine though that the anoles are incredibly active and as mine climb all over each other and continually drop out of their branches onto the ground when hunting might irritate or even stress your gecko. I dont know the requirements of crested gecko's so you should ensure they all have the same temperature and humidity requirements prior to mixing. I'm pretty sure crested Gecko's grow a fair bit bigger than anoles and therefore if he doesnt want to eat the anole itself a passing leg or tail might be mistaken for something edible. Green anoles change colour and I have on many occassions seen them have green eyelids and feet whilst the rest of the body is brown, and vice versa.