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Since you're not using it as a filter, but more as a decoration, you don't need to do anything. For ease of cleaning, yes, you probably want to. Siphon the brown algae, and probably reduce the amount you feed. And water change is probably in order.
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David T.
Hawaii Destination Specialist
Tahiti Destination Specialist
Cogito, ergo sum.
Marine Fish Poop Management Engineer
"It's all about the fish poop"
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