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Here is my tank. I had my artificial reef done here in Hawaii by a company called AquariumsHawaii.com Excellent craftsmanship. Trying to preserve natures reefs. Have some artificial corals and stuff.
The rocks are real with small pieces epoxyed together. I think they used somekind of resin and a special kinda paint. I think they painted to rocks black and used a blue color type of resin for the coraline lookalike. I use a simple tooth brush and lightly scrub the rocks and coral. It came in 8 different pieces and you pretty much arrange it urself.