Limestone would help buffer your FW tank because it will actually dissolve rapidly in FW at a more neutral PH... in SW we want our PH high enough to support calcification... conditions not condusive to dissolving limestone. The only reason you will get dissolving with aragonite sand is because the PH is lower in the deeper layers.
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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