Interesting tank behavior....... I just switched to useing RO water, I have done one 10% water change and have been doing top offs with the RO as well . . . . when ever i put RO in the tank {salt mixed or straight} the tank looks as if there is "smoke" in it ...rolling around in the currents......after a few hours the water is crystal clear.....anybody got any ideas what causes this? it almost seems like the RO water is "ripping" the non ro water in the tank...i'll be interested to see if this "smoke" gets less and less as the water in the tank becomes more and more RO - - -Snowboss