Are they the red flatworms? Those are the bad ones. A search on flatworms, planaria or flatworm exit should bring up numerous threads on them. Natural predators are some wrasse,s like the six line wrasse , yellow {banana} wrasse, mandarins, even yellow tailed blue damsels. All these are a 50/50 shot at eating them of course and cant keep up with their reproduction rate if they get going. Siphoning them out helps also.
If going to use "exit", read up on it good and be aware of the toxin produced from dead flatworms.
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Doug
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