·         Material:Sponge @ This product is suitable for sea water tanks, fresh water tank, water plants cylinder, the size of the free cut. @ Biochemical cotton decomposition of excreta and feed residues, improve water quality filter clean. The best results. Reduce fish mortality. @ Biochemical cotton decomposition of excreta and feed residues, improve water quality filter clean.@ Secret hole clearance and softness is most suitable to cultivate a hotbed of good nitrifying bacteria through expert analysis
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