i am about to use some Flatworm exit on my tank..my last shipment of corals will be here tomorrow..i plan on treating the whole tank..i already have flatworms, so there is no use in dipping the new corals in FE..i know the worms release toxins when they die...will this affect my corals?? what should i look for??? i also remember someone saying that the recommended treatment time doesn't work.. how long should i leave the treatment in the tank for????