I will be starting a new planted tank in the next few weeks and am trying to decide which substrate to get. I'm planning to do 2 layers, with the top layer being natural colored small (1/16") gravel. I can easily purchase from PetSmart or Petco, so I have looked at both EcoComplete and FloraMax. Does anyone have opinions on one or the other? Also, I'll plan to do approximately 1.5" of each - does that seem like a good ratio?