Oh lord. I was warned by the seller. Oops. Wish me luck on this one. Make that two. There's two colonies in my 10 gallon tank.
Here's one:
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Yep, that's them. Nice for a while but once they decide to take over there's only one way to get rid of them. Search for fluke tabs on here and you'll find a thread about getting rid of them. Fluke tabs will get rid of Xenia and GSP also.