sphagum peat moss... several brands to choose from, just make sure it's 100% pure peat moss. *no additives*, ie. fungicides, pesticides, fertilizers, etc. Peat with extra stuff in it is rare, most companies sell the stuff straight, but occasionally there's a product with added miracle gro, etc. however, with your kh and gh being what they are, i doubt that the onyx will affect anything at all. steer clear of water softening pillows, etc. they just exchange Ca+ for Na+ or K+, which leads to water that's even more out of whack than before you changed it. Peat exchanges H+ ions for the Ca+, which the plants and fish don't particularly care about, as long as your pH doesn't swing too wildly as a result (which it shouldn't because... oh, nevermind.)
Anyway... long story short:
1. Pure peat.
2. No water softener.
3. Yes to Onyx, it will barely affect your gh and kh.
4. If softening is essential to you, see #1.
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