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Triple dose of Flatworm exit, then a big water change....Search the website for cures...There should be a few different threads on ridding your tank of Flatworms.
I'm not sure you got them from water in a bag...they can come in on rocks and coral frags, you usually won't find them floating...
I wonder if those lights on the ceiling and the ambient room lighting is what lights it? It doesn't need anything special...looks like all the corals are fake. (I think!)
Good luck with the tank, Harry!