Bubble algae is a tough one. Some say Vibrant helps more say it doesn't. Manual removal is the most reliable, although this will be a never ending battle.
I once had a Sally Lightfoot Crab eat them like crazy (many many years ago).
Confirm your calcium readings with a completely different (brand) test kit. Have you tested the newly mixed salt? I know Reef Crystal can sometimes mix high but not in the 600 range.
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