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I pulled this rock out as it looked black in the tank but is covered in slime green. It smelled horrible so I tossed in a bucket with water, vinegar and peroxide. Will see in a week or two and decide to keep or toss.
I also decided to clean that black foam in the sump. Why did Red sea think this was a good idea as it was a bitch to get all 5 sections out. I ordered another that I can cut to size to make cleaning easier.
These were dirty but not as dirty as I though as I have not cleaned it since the tank was setup in Jan 2027.