Reefing Woes - Water Issues

So my 150 has been an uphill battle every since it got wet.

Crazy algae outbreaks, dosing pump malfunction causing levels to be all over the place, lots of SPS death...etc.

So I'm currently still scratching my head as to an issue as to why I can't get SPS to thrive. I finally fixed the issue with the dosing pump. Current levels are

Alk - 7.8
Cal - 400
Mag - 1440
PO4 - 0.0 - 0.04 (Red Sea Algae test, colors seem similar)
NO3 - undetectable by Red Sea

What I am seeing alot of is very slow tissue necrosis of SPS, some starting from the base up and some starting from the tips of SPS. The issue is its random pieces in my tank and not all one type. In addition with these same pieces there is little to no PE and some of the same types of acros have great PE only an inch or two away.

I am very confused and not sure what to do next
 
You didnt mention salinity. In my experience RTN in SPS always follows salinity fluctuations. Anything outside exactly 35 ppt, and anything more than 0.5 ppt fluctuation, can lead to this in my experience.
 
You didnt mention salinity. In my experience RTN in SPS always follows salinity fluctuations. Anything outside exactly 35 ppt, and anything more than 0.5 ppt fluctuation, can lead to this in my experience.

Measured this morning it was 34ppt/1.026 SG with Milwaukee electronic refrac
 
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