Well most know every once in a while I test 0.25 and change water and at times it made very little difference. Then tomes it tested ok. Well I changed My RO/DI filters , checked water comming out of RO/DI discharge and no anonia . Checked tap wter none . checked water that I had stored for a few days maybe 5 with power head in rubbermaid bucket and none. Checked water in 5 gal bucket i had just added salt to and let mix for a day and it tested 0.25 amonia. Called DR. Foster & Smith and told the teck in Liveaquaria all this and she said did i have any moisture in my busket of reef crystals salt. i said yes it's not as dry as it usually is. She said that salt that gets moisture in it picks up choraline algie microscopic and this will cause amonia in newly mixed water stord a few days. What you all think. How to keep humidity out of salt bucket just opening cover lets humid air into container . So this is where I'm at.