albino shark

Is it normal for an Albino Shark to lose and gain his color daily? I currently have a 65 gallon tank with: 1 Albino Rainbow Shark 6 Tiger Barbs 2 Siamese AE 4 xray Tetras 3 Hatchet Fish My Rainbow shark has deep red fins and tail. However only at 8am. Come 3pm the red has became pale, and...