If done correctly Flatworm Exit is a great product. I've personally used it twice with NO loss at all!
Here's the #1 key to using it successfully. Have make up water ready and change after 15-20 minutes of treatment. You do NOT want the dead flatworms in your tank for any length of time, period!
On my 26g I double dosed Flatworm Exit. Within 2-3 minutes there were 100's floating everywhere. For the next 5 minutes I was a netting fool!! After this I drained out 5g while at the same time sucking out more worms. The entire treatment lasted no longer then 15-20 minutes! Time is important!!!
I repeated this same process 2 weeks later and haven't seen a flatworm since.
My live stock-2x Fish
Hermit
Cleaner Shrimp
Asterina Stars
Sails all kinds
Bristle Worms
LPS-Softies & MM's
Again NO losses :)
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