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 IS THE LOUDEST PART OF YOUR REEF SYSTEM?

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