I've just completed my weekly gravel vacuum and accompanying water change. While I was doing this I knocked over a tank decoration upon which my pleco constantly lives when he's not scavenging. When I picked it up to put it right I didn't realise he was still there and my finger touched him. He didn't move and I don't think it was a hard contact, but as it was his head area I'm worried I've hurt him. Will he be ok and is there anything I should lookout for in him?