Black Substrate

  • We are currently upgrading MFK. thanks! -neo
http://www.permacolorquartz.com/Colorquartz.html

I've used this before. It was roughly $25 for a 50 lbs bag. It's completely inert. The difficult part is finding a pool supply warehouse in your area that carries the product.

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Thanks. Maybe I can find some online. It's unlikely that I'd find a local vendor, I'm in the UK and pools aren't really a thing here due to our weather.
 
Ok, so I found some relatively cheap stuff on Amazon, 8 quid for a 10KG bag. Glowing reviews all round so I bought a single bag to see how it is. It arrived today and I'm pretty happy with it. Grain size is around 2 - 3mm, give or take, so hopefully it won't get blown around and sucked into the filter. Thinking I might dump some in a big plastic container with a powerhead and see how easily it gets stirred up.
 
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