Has anyone kept Corydoras with eco-complete as the substrate? I am still in the planning stages of my 125 G high tech planted but I am sold on using eco complete as the substrate, I originally wanted to use eco for the whole tank but is it necessary to have a nice sand area for them? Will they stay away from the eco if there is sand available? How sharp and heavy is the eco? thanks. Originally I wanted to use black flourite sand, but its too light and needs alot of cleaning. Keep in mind i have absolutely NO success with corydoras in regular aquarium gravel.