08-08-2012, 11:50 AM
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I fully agree with Quantum and 1077.
First off, with rift lake cichlids, you need hard water, not soft water which is what 5 dGH is. This is no where near adequate long-term for these cichlids, regardless of what someone may have suggested to the contrary. And Equilibrium is not the way to go, it is expensive and not really suited anyway. Seachem make another product just for fish, forgotten the name at the moment, which would be better but still expensive and not the best method so don't bother.
A substrate of crushed coral and aragonite sand is the only good method for this. The GH will rise, and the pH with it, and frankly it cannot get too high for your fish so I wouldn't even bother on that score. I did this years ago for some rift lake fish, and livebearers, using dolomite back then. But the sands now available made from crushed coral and aragonite [coral is calcium, aragonite adds the magnesium bit] are perfect for this task, and very natural in a rift lake aquascape.