Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Tahitian Moon Sand.
Look in the local rock yards for whatever gravel you might like, then test for GH, KH, pH or TDS problems.
Pebbletek makes a line of products that are added to the inside of swimming pools to make them different colors. The materials are mostly a very high density quartz, completely neutral and aquarium safe. Some of these include sea shells (do not use that series) Find these from swimming pool contractors.
There used to be a line of products for sports fields that had a very dark grey that almost looked black under water. Soil Master Select was one, but it is not being made any more. Turface is a similar material, but I do not know if there is a black or charcoal color. I do not even know if it is still on the market. However, check out stores that sell to contractors and maintenance people of sports fields, golf courses and irrigation wholesalers. These materials are lighter than sand, have high CEC, and usually remove the KH from the water.
Turface is still availalble, but the darkest is a medium reddish-brown, you would have to find some and look at it darkend (wet) to see if it is dark enough for you.
Last edited by Diana; 09-15-2012 at 08:53 PM.
Reason: Researched Turface