AQUAYER Yermolayev`s fertilizer Potassium – concentrated fertilizer for aquatic plants containing potassium. Necessary for new aquariums with plants, as well as for older aquariums with plants demanding high potassium content in the water. Part of Yermolayev`s system of fertilizers for aquarium plants (see infographic below).
Symptoms of potassium deficiency
Small round holes appear on the leaves. Yellowing of older leaves and their subsequent extinction.