So I needed to make up some magnesium to dose to my tank so I followed 200g in 1000g of rodi water in a plastic 1gallon mixing container (brs). When I did the reaction was heat which i was expecting but alot of heat like to the point of melting the 1 gallon jug some should i not use the magnesium from this container with fear of leaching? Is it normal to produce this much heat? What would be a better way to make this solution up?