Why the hell do my sps keep dying

[dabandit]

Ok but im sure you allready know what good parameters are but here we go...
75gal single overflow,35gal sump inlet baffle and outlet baffle stuffed with lr pieces,euroreef 120,phosban,phosban with carbon,2x250mh with 2 96wpc,2 koralia 1's,nano koralia,115lbs lr,deep sand bed....thats my equip

Livestock is naso,ocelaris,green spot dragonet +cuc

Parameters are phos.0,nitrate0,nitrite0,ammonia0,cal450,ph8?it was right,temp82,sal1.022,alk10dkh and I've never tested for mag.