SO I bring some water to a near boil (bubbles at bottom of put but not a rolling boil) then pour it into a bowl with per-measured out aq salt (30 level teaspoons for a 10g at 0.3% salinity) and let it dissolve over night, almost 36 hours actually.. do a water change and pour the water in (goldfish are in a separate cube until wc is done) and look how much aq salt is still left! Looks like about 10-15 teaspoons worth. Should I put this in a nylon stocking and plop it in the tank? or it just won't dissolve any more?