To the OP, did your cloudy tank clear itself up? I also had a cloudy (white) tank toward the end of my cycle. Even after a 90% water change at the end of my cycle to get nitrates down, the tank immediately got cloudy. I was using ammonia to cycle the tank so I think whatever was left on my Pukani dry rock must have been the source for the bacteria bloom (even tho I acid washed and let cook for 3 months in heated saltwater in a 75 gallon tub)? Anyway, I was close to buying a UV sterilizer after the 5th week, but lo and behold yesterday the tank started to clear up and today is as clear as glass (~6 weeks total). Patience again rules out. (Note: I did put in a pair of clownfish ~2 weeks into the cloudy phase in the DT along with an airstone to make sure there was plenty of O2 for them--the non-jumper clown fish is doing fine)