I have a nano tank thats been set up for about 3 months now and whenever i turn on my light for a day my rock and sand just get covered in diatoms. I have live rock but not live sand so i dont know if this is a problem. I currently only have a clownfish in the tank and water parameters are all god. Ammonia 0 nitrite 0 nitrate 0 ph 8.4 sg 1.024