So I went out and bought a bag of this from walmart for my 10 gallon, as I read an article telling about its uses in an aquarium. Well it seems the bag or certain company they stocked has bad rocks because the size is huge (or maybe its supposde to be that big?) around 2-3 centimeter nuggets AND tons of tiny shreds mixed in that are a good size. Problem is alot of these rocks seemed broken up and are not all that smooth. THe tank will have corydoras in it and they will have a hard time with these rocks. Has anyone gotten very nice smooth and small pea gravel? Or just recommend me a good aquarium gravel to use, Im aiming for natural colored.