Eco-complete is also a very good black sand substrate. It provides nutrients for plants, and I haven't had any problems with it tearing up filters. I'm not sure if it was on mfk or myspace but i talked to someone who split a ten gallon tank, one half regular aquarium sand, and the other half Eco-complete, then planted the same plants on either side. He said there was a noticable difference in plant size and color within a month. So if you are thinking about planting this aquarium go with the good stuff.