After checking multiple sources for a black gravel I want to use to cover my Mineralized Top Soil in my 40 gallon breeder project, I believe I found the near perfect solution. I wandered into our local AC Moore craft shop today and picked up some black Embellishment Glass Mini Bits which are 2 - 4mm in size.
These glass bits are between aquarium sand size and regular aquarium gravel size in most LFS just what I was looking for.
I believe that these will be a near ideal topping over my soil planted tank because, being glass they are clean so they won't affect the water, smooth so bottom feeders will like them and just the right size to make planting stem plants easy and also they should allow any excess waste to seep down into the soil for plant nutrients.
Anyone else have any experience using this type of topping instead of the usual LFS gravel? Thanks