Please help me ID this

Joined
4 Aug 2014
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Centurion
Today when I got home, I noticed the white fuzzy stuff on one of my rocks. It was not there last night.

Only thing that changed was the introduction of regenerated Purigen. I gave it a bleach wash and had it in Prime for 2 weeks. The rest all seem fine.

I tried to blow it of, but it's not going anywhere.

Thanks in advance!

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