There was a light ozone smell from skimmer built a carbon chamber for air exiting the skimmer and installed on waste container vent, seemed to stop smell. Checked tank this A.M. orp up to 250 skimmer is simmering (flat), did note chevron tang acting strange hovering low on sand bed. I droped to 50mg/hr and set orp to 250 to shut unit down (stabilize for now) hope tang will be ok maybe it was just the initial shock of turning on the lights
new school probe is in sump by the return pump intake opposite the skimmer return and carbon