I would freshwater dip that baby! I did the dip before I placed it into QT and got a nudi off. Problem with nudi's are that they can lay eggs and the eggs can be on there for days and very little will kill the eggs I FW dipped my zoa, placed it in my QT tank and will dip it again on day 3 (tonight) and then wait another week and dip again. I lost a large eagle eye colony due to nudi's. Same with MEN (monti eating) I did not dip this beautiful large brown cap and lost EVERY monti in my system. Had to go without them for about 6 months because of this.