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the chaeto definitely is contributing to your nutrients bottoming out, too. remove skimmer cup and let water run into your sump so it doesn't lower your nutrients but adds oxygen back into tank.Checked everything 2 days ago. Measurements are.
Salinity 1.025
Ammonia 0
Nitrite 0
Nitrate 15
Phosphate 0.14 was .03 2 weeks ago.
Calcium 440
Alkalinity 9.0
Magnesium 1250
Ph 8.15
As far as filtration goes the water from the DT goes to a filter sock in sump, then protein skimmer, refugium with bio blocks and cheato, through a bag of activated carbon and back to the return pump to the DT.
Just got the cheato 1 week ago dosed some cheato grow. Think this could be fueling it?
Looks to me more like dino. Can't go by red colors to conclude cyano. Dino often starts when they consume po4 and no3 and cause biological deficiencies often assumed to be the cause.