Got these from Jireh and all these products are in the form of powder, except for Magnesium which is in the form of shaved ice. According to the lady by the name of Julia, since mine is a 3ft tank, she has advised me to dose 1 flat spoonful of each additive into the corner of the tank daily and they will dissolve in the water. Fish will tend to eat it but that is totally harmless. And of course got to do my usual practice of weekly WC and testing, especially KH.