If your tang attacked him he would more likely get an equivalent to a bee sting and learn his lesson quickly not to go after him. Yes the spines are venomous but like a bee sting they are only deadly if you are allergic. This is a very peaceful fish that is not going to look for trouble, the spines are for defense only and not for attacking. They are really quite timid and pleasant. I hand feed mine every night.
Here is some info about them from marinedepotlive.com
Behavior: The Foxface Rabbitfish may act peacefully toward other fish. THIS FISH IS VENEMOUS. The dorsal fins of this fish can cause extreme pain. Severe reactions can occur if allergic. If stung soak injured area in hot water and seek medical attention.
General Notes: The Lo Vulpinus is a very bright yellow addition to your tank. This fish is often used to control hair algae and in some cases red turf algae in your tank. They are relatively friendly to other fish. Will school as juveniles, but prefers a solitary life as adults. The Fox Face Rabbitfish are reported to occasionally pick a little at zoanthids and Large Polyp Stony Corals.
Your Purple Tang is going to attack any new fish that you put in your tank (it's just their nature) but if you are going to add a new fish and Foxface is probably one of the best because the Tang will quickly learn to leave it alone of get stung.
HTH
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