I was looking in my garden department and came across this Fe fertilizer. I was wondering if it would be OK for my aquariums. The breakdown is as follows: Total N 1% Ca 1% Mg 1% S 5% Co .0005% Fe 4.5% Mn .05% Mo .0005% Zn .45% N from urea, Fe from pyrite or Fe Sulfate, Sulfer from pyrite and sulfate and all others from sulfates. Is the inclusion of so many sulfate based elements harmful? TIA Bridget