Does anyone know what could cause this??? Overnight, woke up and they'r really light in color.... My SG 1.024, temp 74 degrees F', checked ammonia, nitrates, nitrites, all read zero.... The only thing I did was the night before turned off the pumps for an hour and fed like I usually a mixture of Coral Frenzy, live DTs, Frozen Coral Mix..... All fish are doing fine....