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You can get 1/8” textured ABS black from any plastic / acrylic shop near you for about $40-$50. Comes in 4x8’ sheets. You can cut it easily. Silicone it to bottom of tank (GE clear silicone I). Prevents rocks from damaging tank, allows coral growth on bottom. I took the remaining and siliconed it to bottom of stand as well to waterproof it.

