Red Sea Foundation ABC+ (Skeletal Elements) powder
all-in-one
Partly derived
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What one dose does
PARAMETER
1 g / 100 L
Calcium
+1.5 ppm
To raise calcium by 20 ppm in 100 L: 13.3 g.
Maker’s daily maximum: 13 g per 100 L (13 g for 100 L).
How it’s used
Dose dry into the sump daily according to measured Ca uptake. If dosing daily, test Ca/Alk/Mg weekly and correct drift with the individual Calcium+, KH/Alkalinity and Magnesium. Red Sea suggests it for tanks up to about 300 L/75 gal.
Cautions
• Never add more than 60 g at one time to any system; give 10 minutes between spoons so it dissolves without precipitation
• Add directly to the sump; do not dissolve in top-off water
• Do not use it for periodic Ca corrections; use Calcium+ for that
• Only dose Iodine+ and Potassium+ alongside it according to measured uptake (ABC+ already contains K, B, I, Br)
• Do not combine with KH Coralline Gro
Sources
Only the Ca figure is published. maxDose derived from the 20 ppm/day Ca limit (20/1.5 = 13.3 g per 100 L/day), separate from the 60 g single-addition cap. If the product is truly in skeletal ratio (~20 ppm Ca per 1 meq/L Alk), 1 g/100 L would add roughly 0.075 meq/L (0.21 dKH); that is an inference, not a Red Sea figure, so it is not in effects. Measuring spoons supplied: 2 g and 20 g.