How much crushed coral per gallon?

[neven]

Good call, I've been converted to buffers for a long time and wouldn't go back. I once eventried to see how high I could push the ph and kh for a guppy tank, wouldn't even go above 9 degrees kh. Unreliable on both sides of the spectrum unless you have co2 injected.

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[gklaw]

I think there is some misconceptions about using buffers and crushed coral especially. Unless you are creating an acidic environment specifically by injecting CO2, or using peat, etc. there is only a small amount of the material that will dissolve. The dissolution rate is dependent on the pH and the amount of cations available in the water.

Well said Gary I was suspicious of the misconception for a long time. Glad to hear that from a geologist.