It's a brown algae that grows back over night and sometimes has bubbles in it. It looks to me as dyno's but I could be wrong. It brushes of the rocks real easy but covers everything even my gsp when it withdraws for the night.
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206 gal tunze centre overflow star fire front illumina 260
Loudest part of my system would be the nagging sound I hear on a regular basis about how much time and money I spend on the tank.
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