EVERBODY IS THROWING BAD ADVICE AT YOU!!!! Except Awibrandy And Tosiek.
You will never get rid of it without understanding it. There is no quick fix!!!!
I was a new reefer and understand the eagerness to just want an immediate response. Good community in the sense that everybody gave their input/experience. Everybody has different methods that work/certain ways of doing things (duh...but we must be reminded).
I used Aiptasia X (back then a relatively new product) and Peppermint shrimp. The Aiptasia X gets rid of Majanos and Aiptasia. The methodology remains the same: clog the mouth so nothing is released and have the pest implode. The trick is you have to use Aiptasia X properly and in generous amounts. I've used it on my tank and two other friends' tanks (who were reluctant might I add) and it worked like a charm.
The key to this is to make sure the mouth is fully covered and that the approach is slow so the Aiptasia doesn't recede/release spores.
Peppermint shrimp can get pricey and are hit or miss. Granted, I had 5 in my 54 Gallon Corner tank. The peppermint shrimp didn't get rid of the big colonies off the bat until I used the Aiptasia X and they were used to get rid of any minuscule spores that I couldn't reach. Too bad, my royal gramma ate the shrimp.
Also, when people ask for updates please provide them. We are excited to see the results.
I have had peppermints eat corals!
I would get a copper banded butterfly fish(Ive never had one last longer than my aptasia. They are very difficult to feed(b/c they generally wont eat anything that isnt growing/living inside the tank), but they are excellent at eating aptaisia(which will come back after the fish is gone).
Have some Aiptasia as well. Squirted with boiling water but didnt work. Used Vinegar Saturday and it seemed to kill a couple. There a few which are in difficult spots so its tough to get a direct shot at them. I read a few things online and tried the vinegar method cause it seemed the easiest...Had no idea they can release spores...but guess its too late now...