I'm still trying to determine the substrate for a new 60 gallon low light tank. I've reading as much as possible and I'm considering the black diamond sand from Tractor Supply. However, they offer two variations:
Yeah, I'm using a different brand (black magic) that is between black diamond's medium and fine, and I'm pretty sure the compaction is crushing the roots on my vals. Wanted to try compact swords but worried about rotting roots...
I'm about to pull the trigger on some BDBS to redo my 90 and had the same question, Thanks for asking it! Seems like the medium is the most popular so far.
Black Diamond makes:
40/80 extra fine
so it seems like there is a bit of overlap in particle size between the products if I'm reading this correctly. Smaller # is larger particle? I'm guessing the 60 to 80 size is too likely to compact over time and the 12 is maybe more like full size gravel?