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I haven’t checked my magnesium in some time . ( 3-4 months ago) but I do monthly 25% water changes. Red Sea blue bucket salt mix . That parameters I check for are temp,alk,phosphate, nitrates. And SG . Lately I’ve been thinking of inorganic phosphate? Because of no skimmer. So I set a HOB skimmer, with a timer to 3 hours a day in one hour intervals. But all it did was kill all my macro algae. So it’s on 1 hour a day . Usually nutrients are spot on . Phosphate @.040 and nitrates @12-16 . I dose kalk through a doseing pump maintaining all @ 8.4 honestly I never check calcium.
the only time potassium has been checked is last summer during a icp test . Thx
the only time potassium has been checked is last summer during a icp test . Thx


