I am thinking about getting some geophagus red head tapajos, but I am torn between a dark vs a light colored substrate. I know that a member of another forum with a massive discus/geophagus tank uses white sand and his fish are amazing. I want something that will make the color pop, as well as being fine enough not to damage their gills. Do geos pepper like discus on dark substrate, or do they wash out like other fish on a white substrate. My light substrate would be pool filter sand, and the dark sub would be black diamond blasting sand.
