Am I dealing with an ULN issue?

[DorySaid]

Typically alk swings would cause those symptoms.
As far as the alk level, it might be a bit too high since your nit and phos levels are almost undetectable.
Apparently, because at a higher level of carbonate/bicarbonate, corals can continue to grow through elevated levels of nutrients.

[DorySaid]

By the way how much rowaphos did you add into what size system. Maybe the corals are starving?

[Animal-Chin]

125 gallon and the middle size container that’s supposed to do 125 gallons. I’ve been using it for 3 years but with my small skimmer I always had some phos even while using it.