Since I’ve started reefing I have been struggling with Alkalinity and low Ph My corals are not struggling but they are not growing either average ph is 7.3 and avg Alk is 6.8dkh. Confirmed by my Hanna checker and my Trident. All of my sps look the same as the day I took them out of the store no discoloration no growth. Any legit suggestions? Roughly 120gallon system