Hello, I will be setting up my 35 gallon tank soon. I intend to keep cory's for my bottom dweller and possibly a bristle nose pleco, I may also keep an apistogramma. I have read that sand is best for cory's. I have found some black diamond sand blasting sand at my local tractor supply. I found fine blasting abrasives as well as medium blasting abrasives. would one of these be the preferred substrate? Thank you for any help.