I have a year old 20 long nano reef. For the past three days very few of my zoos have opened. I have tested the water the past few days and everything is normal (0 nitrates, 0 nitrites, 0 ammonia, pH 8.2, cal 425ppm). I have two 65w PC, 1 10k and 1 50/50. The 10k was replaced about 2months...