Hi, my first post. I thought that this would be as good a place as any to start. Don't you guys think that the darkening is a sign of dominance/aggression? Like Clown Loaches. Anyone that has kept them has probably noticed that the Alpha Loach is always darker. Dats do this too. It's really noticeable in IT's that aren't always stable in their color. Heck I even had a Fahaka that did the same. Feeling secure will also affect shade in their chromatafors.(I think that's what those cells are called) Susbstrate and tankmates/environment will affect this. Just my two bits.