Guess what this is

Some sort of new crystalline filtration media, potentially resin or polymer based for extracting either copper or nitrate?
 
Ok the answer is the inside of a DROP scrubber showing bare Green Grabber rocks without growth, and the lights of course are on.

im not familiar with your scrubbers besides your surf line. I myself will be using a CW waterfall scrubber due to space constraints. But any working scrubber is a treasure
 

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WHAT DO YOU MOST OFTEN NOTICE IN YOUR REEF AFTER LIGHTS OUT?

  • Fish settling into their sleeping spots

    Votes: 5 55.6%
  • Corals extending feeding tentacles

    Votes: 2 22.2%
  • Pods and other tiny life on the glass or rock

    Votes: 2 22.2%
  • Worms, brittle stars, or other cleanup crew

    Votes: 3 33.3%
  • Crabs or shrimp out and about

    Votes: 3 33.3%
  • Bioluminescence (actual light produced by organisms)

    Votes: 0 0.0%
  • The tank looks pretty much the same to me

    Votes: 0 0.0%
  • I rarely look after lights out

    Votes: 2 22.2%
  • Other (Post in the comments)

    Votes: 1 11.1%
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