Dosed flatworm exit...

[badfish!]

When I used flatworm exit, I just ran carbon, and I didn't notice any problems like that, so perhaps it is an issue with the phosphate (that being said, I have only zoas and acans in that tank)

[albert_dao]

You're better off with water changes over carbon. Using massive quantities of carbon can stress your corals out just as much as a million dying flatworms.

Now, given that it's too late to siphon out visible flatworms PRIOR to using the product, here are some guidelines to casualty free Flatworm Exit use:

- moderate carbon use
- frequent, medium (20%ish) water changes
- insane flow
- emptying your skimmer cup every time you walk by the tank

That's about it. As long as you follow those through, you'll be fine