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Flatworm ID

DEIGNAN14

Well-Known Member
BRS Member
Noticed a few of these in my fuge today. I think they are probably harmless but would like to know what you think.
 
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There are a lot of species of flatworms. There are only two that I'd be fearful of. The big red ones, and those are usually pretty easy to spot. The Acropora eating ones, and I think you are unlikely to see those tooling around on the glass. The ones in the photo do not look problematic, but hard to tell from a photo sometimes.

Here's a pretty good photo of the big red ones:

 
Red 1s bad, very bad. They are can easily overrun the tank if gone unchecked.
 
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