Getting started on my second grow and want to have a good growing medium but am unsure of a couple things, any advice would be appreciated.. So far I have bought worn castings, perlite, and sphagnum peat moss. Is this enough with straight worm castings or should I buy a soiless mix to add with it? I have a little organic potting soil left I used for my last grow could use that? I've been reading a ton of mixed reviews on what to use or not use. Anyone have a basic ratio formula they would recommend? Thanks.