<h2>H&#046;B&#046;H&#046; Enterprises - Balance Blocks 2 pack</h2><p>BALANCE BLOCKS stabilize pH levels of salt water and reef aquariums to match those of the ocean&#046; Balance Blocks slowly dissolve, releasing calcium and 71 vital trace minerals for use by fish and other organisms present in reef aquariums </p><ul><li>2 Pk</li></ul>