02-08-2021, 08:25 PM
Join Date: Nov 2020
| | Re: How-To: Mineralized Soil Substrate, by Aaron Talbot
Does anyone here keep invertebrates? I've given this recipe a go and it appears to have created a toxic environment for my shrimp and nerite snails. Several batches have died, even after isolating one variable after another. Meanwhile, I'm keeping another dirted tank, utilizing the same tap water and many of the same plants, with zero issues.
I raised this issue
on the El Natural forum, and Diana Walstad mentioned: "Many clays contain aluminum. The clay may be fine by itself, but when you mix it with an organic soil, the organic matter can solubilize the aluminum oxides and release toxic aluminum into the water. Invertebrates are particularly sensitive to heavy metals, which includes aluminum." She also was concerned about using solid potash.
I've spoken with two others who have used this mineralization method and cannot keep invertebrates in those tanks, despite being able to keep them in other tanks. It seems quite likely that something toxic is being leached from the soil substrate.
I'm very curious if anyone else has experienced an issue like this using the mineralization method suggested in this post.