Your foxface could only be a problem if you try to grab him. Even, and especially if netting him. Do not attempt to hold him. He is no threat to you in the tank unless you corner it IMO
If one is prone to picking or biting off hang nails, or anything that results in even the smallest abrasions or tiny cuts in the skin, I'd suggest a habit of wearing gloves virtually all the time. I've done pleny of work in my tank with bare hands. Just gotta be aware of the skin or nail conditions you're dealing with at the time.