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There is a New Life Spectrum formula for almost every freshwater fish
Biological filter sponge
A (Min) 10000 IU/Kg
5W X 21D X 26CM H (BLACK)
D-D True Seawater Refractometer Mat There is a New LifeWhat is different about the D D Seawater Refractometer? Almost all hand held salt water refractometers available to the hobby are designed and calibrated for the testing of brine solutions, i. e. sodium chloride, and are not calibrated for the refractive index of natural sea water. Even though the largest percentage of salt in the sea is sodium chloride, the presence of other significant ions such as magnesium and calcium in natural sea water results