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Unsure by the blue lighting but it looks like dead GHA
It's time to take out the toothbrush and start scrubbing the rocks off.
Use h2o2 ( 3% peroxide ) and pour that over the rocks.
With this method there will no longer be any nusence algae growth.
Pay close attention from that point forward to what you put into the tank (frag plugs and corals). This is how algae of this kind is introduced.
It's time to take out the toothbrush and start scrubbing the rocks off.
Use h2o2 ( 3% peroxide ) and pour that over the rocks.
With this method there will no longer be any nusence algae growth.
Pay close attention from that point forward to what you put into the tank (frag plugs and corals). This is how algae of this kind is introduced.