londonloco
Members
IMO, the answer is use both. One of the things that make many aquariums look artificial is that aquarists too often use a uniform substrate. Nature almost never practices this kind of quality control. A mixture of sand with small and medium gravel gives a nice, natural appearance. The specfic mix is up to you, but I find 70% sand, 20% small gravel, and 10% medium-large gravel gives a very nice look.
I'd like to see a pic of that.....