just remember when you use this stuff they release a toxin that will kill everything in the tank. follow instructions carfuly and start removing the flatworms as soon as you see them start to die and do alot of water changes right after you suck up as many as you can water changes once you start you can't stop or run the risk of loosing your stock. have alot of salt water pree made, I have read that some people have change up to 50% of thier water in quick secsesion 25% at a time. so 50% the night of the treatment and 50% the next day. Wate a few days and see if there are any left if there is still a tun of them you will have to retreat the tank. once is normaly enough.

Bill