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Brain-storm is apt description of your present substrate hunt. You want the substrate to do everything for you at the same time.

Take MGOCPS and red clay in equal part and add to it a couple of hand-full each of powdered gypsum, dolomite and calcium phosphate and mix everything well. The quantity you want of this mixture should form a one-inch thick bottom layer in your tank. Don't wash this mixture, after spreading it you spray/sprinkle it with water and pat it down.

Now mix CEC and your black blasting sand equally. You will need twice the volume of your bottom layer. Wash this mixture well to get rid of all the fine particles which gets easily washed away. Get rid of the extra water and use this damp mixture to cap the bottom layer.
 
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