It is turface pro league natural color. http://www.turface.com/turface-products/infield-conditioners/turface-pro-league. at first its a bit buoyant until it gets water logged over the first few months; but after that it works great. It has a really high CEC and you dont have to mix it with other substrate to get good results. I got two 50 lbs bags of it for $40. :thm:What substrate is in there? I like the color of it.
That is a Echinodorus "Red special".What's the massive plant growing out of the tank?