Planted Tank Enthusiast
Join Date: May 2019
Location: Palm Springs, CA
Red clay for dirt substrate?
I'm creating a dirted 75g tank, and remember reading up about adding natural red pottery clay as soil amendment & iron source. They'd recommended Amaco Mexican red pottery clay, but this is in a post dating back to 2011. Went to Michael's and thought I'd found exactly what I needed--a 10lb box of Crafstmart natural terracotta clay made by American Art Clay Co (Amaco). But reading the small print on the box, it says it's "treated to ensure freshness." No idea what they use as a preservative. Reading online, I see mention of sulfur sometimes being added, but no way to tell if that's what's being used here.
Has anyone used clay in their substrate? If so, what kind did you use, and where did you get it? I'm already using SafeTsorb to cap my dirt, so maybe that has enough clay in it? If I'm not 100% I'll just skip it, but was hoping to be able to use clay to blend in and weigh down my potting soil which has lots of perlite in it.