Best gravel for drainage layer?

[TxScarlet15]

I'm setting up a natural viv for my MBK and I want to try something different for this one than what I did for my GBK. Someone commented on one of my previous threads that I could try a layer of gravel on the bottom for drainage, so I'm wondering what is the best size gravel to use. Should I use something like this Quikrete 50 lb. All-Purpose Gravel-115150 - The Home Depot Or more like this one Vigoro 0.5 cu. ft. Pea Pebbles-54255 - The Home Depot Is there something else anybody would suggest? And I was thinking of just using this New York Wire 36 in. x 84 in. Charcoal Fiberglass Insect Screen FCS8558-M-FCS8558-M - The Home Depot to put between the gravel and dirt layer, would that be alright? Any and all suggestions are welcome!