Hey guys.. i'm looking to kit out my RIO 180 with a new substrate. Currently it is an inert black gravel (looks like rolled crushed glas tbh) I'm quite keen on ECO Comlete as its a black substrate and wont mess with the water chemistry. I would be introducing fish to it immediately in a kinda substrate switc operation. I was also toying with the idea of adding some tropica substrate beneath it to add some extra nutrition as I plan to plant quite a lot of crypts. Has anyone got any advice on this aspect of things and can anyone recommend a well priced UK delivery place.