Montis losing color from the center?

M

mkengr45

Member
I have a large purple haze and superman monti that are not extending their polyps in the center of the piece. The outer rim about .5 inches or so looks normal, but the middle of them has poor polyp extension and color loss. Any ideas what it could be? I have not changed anything in over 6 months. Tank is 90% SPS. I dose two part using GHL Profilux controller

Tank parameters
144 half circle
3 AI Sols
Alk is 10
Cal 420
PH always between 8.1 and 8.4
Phos is zero (Hanna meter)
Mg 1300
Salinity 52 mS (pinpoint salinity monitor) also verified with Profilux and refractor to be 1.025
 
Mine did that also. I dont know from what exactly but my alk dropped and I dosed iodine for the first time when it happened
 
Did you find out how to fix it? I was thinking potassium maybe? Use something like brightwells reef replenish or their potassium. I hate to dose blindly though...I do not have the potassium test kit plus I know the potassium testing is a pain in the butt.
 
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