The Planted Tank Forum - View Single Post - Substrate on top of BGA?
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post #3 of (permalink) Old 05-28-2014, 11:55 AM
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Should be OK. I've had an attractive layer of cyanobacteria below the surface of the substrate against the glass ever since I've set up my tank. It's done no harm that I can tell, and it has never migrated to the tank proper (knock on wood!).
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