Fox face are not agressive at all, They will only use their spines if they feel in mortal danger. But you yourself need to be careful when working in the tank. Make sure you don't come in contact with it. It will sting like heck, sort of like a bee sting. But if you are sensitive to bee's or spiders, just to be safe, I would pass on it. You don't know how severe a reaction you could have. I've had three over the five years in the hobby, and they are likely, going to run and hind in the back of the tank, before they would ever try anything else.