I think I'm worrying to much over the size of sand I'm gonna put in my tank. I first bought the black sand blasting slag to use. Then I read it was to course or sharp for bottm feaders. So then I bought some sand that was in a tube, used for weight in the back of your vehicle. When I opened this it seems like have of this real fine and I'm wooried it will compact to much. I plan on putting peat moss and Laterite down first. I already bought the moss & laterite. Am I thinking to much? Also, if I did go with something else like Eco, ADA or Flourite, could I still use the peat & laterite on the bottom or would that be over kill. I plan on doing DIY CO2 and my Ph is over 8.0. I have just about everything to get going, but I can't make up my mine about the substrate.