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What size medium did those of you use, that have used the black diamond / beauty blasting abrasive? My local tractor supply carries a 20/40 and a 30/60 grit.
 

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I'm doing 100lbs of pool filter sand and 50lbs of 30/60 coal slag in my 72 gallon bow. It's a little bit finer than 20/40, but it's plenty coarse to settle out and not cloud the water. A finer grit will slow down the speed of root-tab nutrients leeching out into the water column. (the finer the grain, the less interstitial-space there is between each particle... the less space there is, the harder it is for water / nutrients to circulate through)


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I could only find it in one grade. It is particle ranging from "dust" size up to about a mm in diameter. Rinse for dear life! or be prepared to scrap a lot of filter floss. Plants root and anchor well. No fish problems.

In the tank it almost looks like a mix of mulm and obsidian.

It will pack to some degree.
 
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