I'm still trying to find out which is easier on the bottom dwellers: cory cats, loaches, etc. I have plants, but nothing requiring any special substrate. I will use the eco-complete planted aquarium by CaribSea or the Tahitian Moon depending on which, if either, is safer for the fish to dig around in. I want something black or very dark. Does anybody know how and where I can find out about this? I've lost count of the times I've heard about the 60 pound bag of black aquarium sand gotten for $2 at HD (or they don't remember where), so please only mention that if you know where I can find it in the Northeast (or it can be ordered by the LFS) and if it works for these fish.