I really don't know anything about chameleons, but when they curl their tails, it's a sign of aggression. Maybe give him a little space??
Thats not neccesarily true. My chameleons curl their tails just about always except when they are moving. They curl it the most when they are sleeping. Signs of aggression would be changing colors, opening mouth, puffing up.but when they curl their tails, it's a sign of aggression.