My fire shrimp was molting about every 2 weeks up until he died. My calcium is 380-400 range said:You need to test for mg if you have a reef tank as mg is what keeps alk and ca in balance. Low mg can interfere with molting
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Mag was at 1380 Calcium 360 Alk 11 dkh said:Mg is good. calcium is a little low and alk is a little high.
Did you dip any corals in bayer insecticide recently?
Also check salinity if you have a refractometer. I killed my peppermint shrimp when I accidentally lowered my salinity to hypos salinity levels
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