My octopus has been jetting backwards into the corners of my tank recently, never noticed this behavior until about a week ago...and never with my other hummelincki. Im worried because now theres definitely some patches of destroyed skin. He does this jetting and parachuting out arms and webbing motion very quickly, and occasionaly hits the glass and keeps going. Would there be any parasites that could cause this behavior, as a sort of "itching"? Its the same 29 g tank, but it doesnt seem to be a room issue, because he only does this once he gets near a corner.