As with any creature put into our tanks, caution should be taken and knowledge obtained. A simple Tang could kill you if it ripped open your finger and an infection started that could not be taken care of with antibiotics. Some marine snails inject neuro toxins that can kill you. The best advice is to know what you have and be careful. Scorpions are slightly more potent than the lion you have. Now if you have an anaphylactic reaction to your lion sting you could be dead also. Hell, you could die going to the store for the fish food.......LMAO............