Infblue;1235350; said:actually black isn't the substrate to increase contrast.
if you just wanna darken the color and don't care about the contrast, then sure, as black will generally darken the base color and patterns alike, thus actually giving the whole fish a very dark look and reducing the contrast.
if you wanna increase the contrast, which is what most people like to do, red substrate is the best, and this is especially true with lapradei and endli.
Thanks Infblue, that's good to know.
O