for the color use a dark substrate to get a black to dark green...white to get a gold with green sheen...from my exp. also no need to starve your fish just feed alottile of the food that it likes the sub a pice of what ever else ...it may take it right away...may take a few tries...point is it will take is eventually...i have never starved any of my fish and they all eat diff foods, like shrimp, fillets, pellets...the only fish that i have that is stubbon is 2 of my retics, but they are picking at other foods...also my hybrid pbass wont eat anything but live fish and live black worms...i am working on it though...it will hit shrimp but not eat it...my orino eats shrimp aswell from the same method...