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I'm contemplating setting up a little Fluval Edge 6 gallon tank to use for DSMing plants. I have a bag of Petco large grain black sand left over, but I was wondering if I should splurge a bit and get aqua soil or something like that from ADA?
 

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Sand has no cationic exchange capacity. The better substrates can hold the fertilizer in a way that the plants can get them, acting as a reserve supply.
 
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