Going on 2 days, with not a single sign of any mortality or ill effect by this product. Whew....I re-treated on Sunday, about 24 hrs after the first treatment, because I saw what seemed to be a few straggler-survivor flatworms. This time I ended up using the rest of the bottle. It turns out that there are about 300 drops in a bottle. Several people had posted that they were using 2-3 times the recommended dose (1 drop/gallon) to get all the flatworms, so I went for it.

The unexpected thing is that after running the carbon for 2 days, my water is noticably clearer. It makes sense, but I didn't notice any coloration before. Also, I've run carbon before with a bag in the drain area of the sump, but have never had this kind of result. Of course, this is way more carbon. (2 quarts) For anyone thinking about using flatworm exit, I would suggest doing a search on reefcentral to find "flame*angel" 's long thread about it.

Matt