I've seen it and heard of it, but is it safe for fish (I mean do I really have to watch out for anything?)
Also I'm trying to get my tank as natural as possible (habitat-wise) and is a substrate the way to go? I have white aquarium gravel that I hate the look of
so just wondering if a substrate would work better to grow live plants in 
Also I'm trying to get my tank as natural as possible (habitat-wise) and is a substrate the way to go? I have white aquarium gravel that I hate the look of