percipitation problem

[rocksteveo]

So ive had my doser up and running for a few weeks now and things were going good, minor adjustments here and there but things are pretty stable.Today i checked my parms and my cal was really low 320ppm, usually around 390 -400ppm, mag was at 1400,alk 9.5 ,pottasium 400ppm, then i noticed some white crude on sump wall right where i drip my chemicals in. im dosing mag sulfate and cholride 1st then soda ash 2nd, then calcium chloride 3rd. the soda ash and calcium are dosed equally and around 20 minutes apart from each other 10 times through out the night. what im i doing wrong to cause this and is this gonna have any ill effect on tank? any help would be great thanks in advance Steve