That's a good point, I I hadn't considered the roots of HC being shorter... Most of what I've read about dirt tanks suggested to use the same thickness of dirt as a cap. So if I use one inch of dirt I should use one inch of whatever cap I use.
The issue with using a thinner cap comes up with the possibility of dirt getting into the water column. Which would result in a messy tank...
That is something I'll have to think about and experiment with...
The issue with using a thinner cap comes up with the possibility of dirt getting into the water column. Which would result in a messy tank...
That is something I'll have to think about and experiment with...