This fertilizer is shrimp safe when used as directed. K, Potassium - ∆ppm/1pump/10gal = +4.68ppm. Mg, Magnesium - ∆ppm/1pump/10gal = +0.39ppm. Fe, Iron - ∆ppm/1pump/10gal = +0.26ppm. - Dose 1 pump per 10 gallons twice weekly.
eBay