I am starting a new tank, 50 gallons and before I set it up I was wanting to know what kind of substrate I should start with. My goal is to have a fairly natural looking freshwater tank with plants and fish. I'd also like to have a few invertebrates if possible such as snails. What kind of substrate is good for both plants and snails? I have been looking at CaribSea products but can't find any good information about what would be a good one or what would be a good mix. Any suggestions or help would be great!