Tank crash!

[krazykarl]

Wow for those of you who have experienced a tank crash I now know how that feels. I am at a loss and cannot for the life of me figure out what is going on. I woke up this morning to a cloudy white tank and two dead fish. All of my LPS are looking like they a going to die and the SPS are not looking too hot. I switched test kits for MG and not sure if I added too much as i was not used to that kit. I also noticed that the SG was a little high so I took out some salt water and put in some RO water. Not sure what is happening and not sure what to do. I did do two ten percent water changes which has not helped much. I also read that it could be a bacterial bloom and adding an air stone was a must. Any thoughts or advice would be great. Not putting up water test results as i need to get some new test kits which i am used to.