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I had a form of the stuff but it didn't mat, it was stiff and strong but not brittle. KInd of like wire and deeply rooted. It wasn't dense like what you have. It kept growing back so I took the rock out and soaked it in peroxide. That did the trick, but of course it was not an entire tank of rock.
I would hate to think that this is going to be as much work as ridding your system of that sponge was several years back.
I would hate to think that this is going to be as much work as ridding your system of that sponge was several years back.






