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...from 6.4, which seems reasonable. How did Mg shoot up after just one dose? Now that we have reasonable numbers, how can we figure out the right daily does to maintain? Between the display and sump we’re at about 40 gallons. Current #’s Ca 480 Mg 1600 Kh 7 All other parameters are good...

Good morning I would not be suspicious right off the bat of the new addition but would not rule it out either. can you run thru your #’s?

@joe0813 My sps dominate tank is 175 gallons and I run .1 po4 and 30ish nitrates. Like you, low po4 and low no3 led to dead sps for me. My growth and color is amazing once I stopped chasing nutrient #’s

Evening This^^ let’s I’d the algae to know what we are dealing with and your set up and #’s