If you do use Flatworm Exit make sure you get rid of as many as you can before you treat. Multiplying the number you can see by about 500 will give you the approximate number in your tank. When I treated I thought it was going to be the end of my tank, I couldn't believe how many came out of the rock work. 2 1/2 months later and my tank has almost recovered.
I recently read an article that recommended shining a light on the side of your tank overnight, the flatworms will be attracted to the light and can be siphoned out in the morning. I'm not sure if this will work but I wish I'd tried it before I used Flatworm Exit. If you can reduce their numbers before your treat it should be safe.
Rob
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