The alk is low you can get away with it for a bit but too long you can have major tissue losses. Its not good to have large swings dosing and then checking a few hrs later and it was 120 so it was probably higher and fell. I see you are using h2 ocean salt i had the same problem with that salt. It was actually some of the worst salt i had ever used.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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