I would be cautious of listening to anything about "nuking" tanks. I had myself really freaked out in the beginning thinking I would not be good at reefing because you had to know that this could kill this and that would nuke the whole tank if it died, but only if it's a small tank and a big tank would be fine. It's chaos when you get into it. I've had cow fish and box fish die, no nuke. Sea cucumbers, they say they'll nuke your tank but I've not had that experience. Just be careful and do more research before you stress yourself out. If the person hasn't experienced it themselves, I might take it with a grain of salt.