Shrimp tank - uncertain concerning substrate
I have a 30g tank that's ready to become a massive neocaridina tank - but I don't know what substrate to use! I have coarse black diamond blasting abrasive, organic potting soil (no perlite), and can order Fluval Stratum or Pool Filter Sand.
I was wanting to use a black substrate to help with their colors. The tank will be planted quite a bit, too. I don't mind having to add ferts. I will have water lettuce, dwarf saggitarus, water wisteria, java fern, and java moss.
My tap water tests at 6.8/0/0/0 with gH 42, kH 2.
Any help is greatly appreciated ^_^