Generally I find that most fish prefer a darker colored substrate vs a lighter colored one. My main idea on this has to do with them camouflaging themselves from aerial threats. It's harder to see a darker colored fish against a dark colored substrate and the same can be said for a lighter colored fish against a light colored substrate.Thankscich78 , appreciate the pics. Hard to say if I like the fish on the light or dark... Looks good in both pics, lol.
Its not like I dont like mine on the dark was just curious if it stressed him out.