I do not use hot water. Get a brine shrimp net or very fine mest strainer, put the cube of food in it and run cool RO
water over it until thawed. Then rinse with more RO
water just to be sure. The "juice" produced is very high in PO4
. I then put the food in a small dish with some vita-chem, selcon and garlic extreme to let it soak for a few minutes. I add some tank water to the dish and then use a syringe to distribute to various areas of the tank.