this is a very interesting theory. i also have started using an old bag of salt i have had for years . i had been using spoonfuls of salt this old salt in my freshwater tanks
however the saltwater tank was using instant ocean before but now i am using the old hard bag of coralife salt and my phosphates have shot off the chart.
coincidence? maybe.
im gonna mix up some of this salt and test it in the bucket.
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