I have had them a while now... 6-9 months or so and have had Flat Worm Exit and have not used it yet. Been a bit lazy with my tank and wanted to suck out as many as possible before using the Exit and that has just not happened. About a month ago they seem to have started to dwindle in numbers, at the peak it was bad. I think if they keep dwindling in size I’ll still use the Exit to kill them all. They never did bother corals just me.
The reason I never wanted to use the Flatworm Exit with a lot of them is that when they die they can be toxic.
Sorry for the long babble but if I was you I would treat them now before they get real bad. Suck as many as you can for a few days and Nuke them with Flatworm Exit.
Dave
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