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  1. K

    What is this?

    Dark colored stuff in between pebbles. Hopefully not black algae. I don’t know how I would have gotten that. Any ideas or help?! Thank you
  2. K

    Black algae?

    Is this black algae? It’s pretty much only on the Cabo shelf. Should I just continue to scrub with a steel brush daily and high chlorine. Or do something else? Just looking for a little help. Thanks!