I've had my acan for a week now and it has 3 heads, one is perfectly round the other two have a small spot where it looks sucked in to the skeleton and the rest looks fine and puffy? I'll post pics in a bit.
Acans can be finicky. Light I g changes and flow can **** then off and what not. I usually out mine out of direct lighting under an overhang for a little while before I move them out into the more open so its if my tank.
