Mix or layer it?
I just brought some gravel/sand and flourite for my new tank. The pet shop assistant said to wash it all and mix the flourite in with the sand/gravel. But then I read that some people layer it? Putting a layer of flourite on the botton and your gravel/sand on top?
What would be better? Layer it or mix it? Or maybe it doesn't matter, as my gravel/sand is smaller than the flourtie. So maybe it might just be a waste of time if I layer it anyways. As the sand will go the bottom eventually?
Thanks for any suggestions...