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  • 6 Rockwool Block Covers, 40/pk

6" Rockwool Block Covers, 40/pk

sku # 714822
Our Price: $12.99
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White on the front to reflect light and black on the back to prevent light passage, rockwool block covers prevent nutrient and oxygen competition from algae buildup on tops of 4" rockwool blocks. Comes in packs of 20.

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