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Lots of bubble algae. Doesn't have much to do with nutrients. If that's the first you've seen of it in your tank, might want to at the least take it out and scrub the hell out of the bubble algae with hydrogen peroxide being careful not to actually touch the coral. If you're like me, you may wanna think about how much time/effort it's going to take to MAYBE get rid of it one day...
Would highly recommend NOT trying to remove the bubble while the frag is still in or above the tank. Get some tank water in a separate container (tupperware/whatever) and work on it there. Discard the water when you're done. If you don't physically remove ALL of it, you'll still have your problem.
It's an invasive species of algae that's notoriously hard to get rid of (if you even left a microscopic piece on there, it will grow back). Also try to keep an eye out in case any pieces dislodged before you removed them. Like every other type of pest, it hitchhikes in on coral frags (and liverock for that matter). People like to think nutrients play a large role in proliferation but if there's enough nutrients for coral to grow, there's enough for algae. In my book nutrients only somewhat influence the speed of pest algae growth, it'll still be there if you go ULNS. I'd rather have bubble than caulerpa serrulata that pretty much nothing will touch. Fish will pick at bubble (rarely yellow tangs, red sea sailfin much more often, good luck having a tank big enough for that fish, though).I removed it all off the plug. It’s the only place I have seen what is it cause from?