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06-20-2011, 04:05 PM
In my opinion, getting another critter to deal with a problem can be hit or miss.
I'm thinking we need to ID the type of flatworms you have since there are several types. If they are small orangish brown and seem to be mostly on the live rock and glass, I wouldn't be overly concerned about them. Their population will actually recede on its own if given time. You could also try a fish or something that could eat them. I haven't really hear the mandarin recommendation before, but that doesn't mean they don't eat them.
If they seem to be feasting on coral that would be cause for immediate action.
Flatworm exit is pretty effective at killing the flatworms too. I have used it numerous times with no serious ill effects. I generally end up adding more than the recommended dosing...usually go with the recommended dosing and wait to see if they respond. They will start dying pretty quickly when you get the concentration right. As was mentioned, follow it up with a couple water changes focused on siphoning out the dead and dying flatworms and run some carbon.
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