Keeping sand and laterite separate?
I am starting up my 60 gallon soon. I got a lot of the components squared away. I will be using pressurized c02, the lighting and filtration issues are worked out. Now on to substrate! I will be using fine sand as my substrate. Should i worry about placing laterite underneath? I heard through lurking around here that it eventually works its way to the top. I definitely don't want that. How do i keep the layers from mixing? or should i not worry about conditioning the substrate and just feed my plants via the water column? i want to grow foreground plants. HC, dwarf hairgrass, glosso, or maybe a riccia carpet. TIA
PS: I want to grow them emersed and let the runners form the carpet before filling and stocking.