<p>All Sand and Gravel pics are sized 1 to 1</p><p> &#035;00020 (15 lb)</p><p> &#035;00050 (40 lb)&#046;</p><p>Seaflor Special Grade Reef SandTM From CaribSea</p><p>1&#046;25 &#045; 1&#046;95 mm diameter grain size&#046; A revolution in reef&#045;keeping! This is the one you&#039;ve been reading about in all the hobbyist publications&#046; This grade of aragonite is specifically engineered for plenum&#045;type nitrate reducing beds or anywhere a deeper bed is called for&#046; The pore water space created by precision grading also allows maximum pH support and dissolution of calcium carbonate&#046; </p>