Yes thats 1 reason.Dark substate gives them a deeper color,where as light substrate can give them a washed out look.Another is his diet(shrim/talapia/and hikari Krill.Here is a picture of him October 16,2006.and another from november 29,2006Like the color bro...![]()
Is it something to do with the substrate??


But great pic's anyway cujo looks like a real killer and wonderful colors.