03-12-2012, 09:26 PM
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I have used this myself in two tanks, and found that GH went up slightly while the pH skyrocketed. Which was disastrous for me, with my soft water fish. But with livebearers you have less of a problem with a high pH. So one method would be to add more of the gravel/sand. Depending what you GH is to start with, it may vary. In my case, with near-zero GH (less than half of 1 dGH) and KH, using about a cup of CarribSea crushed coral/aragonite raised the GH to 3 dGH and the pH to 7.4, in a 115g tank.
Back in the 1980's I used dolomite gravel in a tank for rift lake cichlids, and the pH was above 8 but in those days I didn't measure GH so no idea; but the fish seemed happy. I had livebearers in a similar setup.
I don't know what the pH would be if the CarribSea is used as the substrate; they may be able to tell you. This product is intended as substrate in marine tanks.
I went to using Seachem's Equilibrium to raise just the GH to 5 dGH. This does not affect KH, nor pH, so I got the increased calcium and magnesium with no rise in pH. But you really want both to go up.
Redchigh mentioned limestone in another thread, but I think that thread was more along the lines of what I'm doing, rather than increasing everything.