I'm in the planning stages of setting up a planted freshwater tank (29g). I eventually want some corydoras in it, so the substrate will be sand. Since what I've read says that aquatic plants don't do very well in just sand, I was wondering what different ways there are to supplement them. I know that root tabs are an option. Could another substrate underneath the sand be effective? I have a bag of Fluval Stratum that I had for a beta tank years ago. Could I spread that out underneath the sand layer for the roots to draw nutrients from rather than using root tabs?
Or would you recommend foregoing the FS in favor of just sand and root tabs?