the other night i turned my lights on,in the early hours of the morning.(heard a noise in the tank and went to see).
i did notice that my leleupi was almost all white in colour,is this normal,because in the daytime hes a very bright yellow.
Completely normal, the color pigments fade because they have nothing to adjust their coloring to with it being dark. Cardinals will be ghost white after the lights go out, the only fish I haven't seen fade in color when lights go out are Discus.