My silver aro likes to be touched. I always scrub clear to my armpits, take off jewelry, and put a little stresscoat in the water, but my aro is friendly when I work in his tank. Now he's all over, wanting me to stroke his belly and he nudges into my work until he gets the rubs. I know it's my risk on being bitten(he isn't aggressive) but in moderation, can this hurt him? He loves it.