I asked Ehsan this very question and he said he uses various wrasses to control any infestations of flatworms. Wrasses such as melanarus, christmas wrasses, six line and yellow coris all have extremely acute vision and can get pick the worms off the corals. Unfortunately, treating the entire tank with a flatworm medicine rarely seems to completely irradicate them. The reason being is that there are several types of worms, some are more resistant to medicines than others. Since the bite marks and eggs are fairly easy to spot even with the naked eye, you may want to remove each acro, one at a time, inspect for bite marks and eggs, (some people use a magnifying lens) dip the coral if you see any signs of marks, and scrape off any eggs if possible. Doing a manual inspection of all the acropora is effective if you can get each one out of the tank. Obviously if the tank has mature stands of acropora this is nearly impossible. I know Joe Yiullo at the Atlantis Aquarium has had outbreaks of flatworms and he gets in the tank and hoses down the colonies with freshwater underwater from a hose. This high powered stream of freshwater blasts the worms off the corals where the fish can them consume them. If anyone has had true success treating their tank with the KZ flatworm stop I would love to hear it. As for the medicines being "triton approved", I wouldn't worry too much about this. Fresh activated carbon will remove most of the medicine once the treatment is done. Just use something that others have tested with little or no ill-effect on their invertebrates, remove with carbon and you should be fine. If you want to do water changes after the treatment just use a good salt like tropic marin pro. Good luck!
