Yikes...what's happening to my tank?

[supersmile]

OK here it goes.... I noticed my kenya tree was dying so I tested the water and everything was OK except salinity.....it was WAY too high. So I began changing the water (Adding regular water) to get the salinity in check. Turned out a lot of the water was changed. Since then my cleaner shrimp and sally light foot crab have died. Now I noticed my sand is turning reddy brown and so is the live rock. My fish (yellow tang, perc, royal gramma), snails, hermit crabs, urchin, starfish all seem to be doing fine. Any ideas what is going on and what I should do? I am moving at the end of the month so I will be moving my tank as well. I'm hoping everything is OK.