flatworm invasion

[Frenchie2]

Got a 90G reef set up since August, LR, corals & fish. Everything was peachy keen until my tank guy cleaner noticed a few little brown critters on the front glass very close to the sand. He told me he thought it my be flat worms. I checked it out on the net, with J&L and sure enough, flatworms are present in my tank. After taking a real close look at the LR, with a magnifying glass, what I thought was brown algye growing was actually an infestation of flat worms - holy doodle - a million of them!!!! Mostly on 1/2 side of the tank where the circulation is weaker. There's lots of flow in the tank. I was advised to get 6-line wrasse (but in my experience, this fish becomes very belligerent towards other mates & shrimps once they become adults, and to syphon the most worms I could, which I did but they seem to come back as fast as they're gone. I was also advised to get the Melafix Marine medication which is safe for fish & corals which would kill the worms, but after the worms die, they release a toxin. So I am in a dilemma here. I'd like to get some advice from you, other reefers. Please help!!!!! Thanks!