Mark Peterson wrote:
Mr. frugal and practical reefer here:Epsom salt can bring that number up and will not cause any problems. Just keep an eye on the Mg level by testing before each subsequent dose.Future testing will give you the knowledge of how much Mg the tank is using and you can use some of the combination products, like Kent Coral Vite, to keep Mg and other elements within proper limits.Â
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The problem with just plain epsom salt is that it is not ionically balanced.
Randy holmes farley wrote an article all about that years ago. To my knowledge he was really the first one to publish using epsom salt to raise magnesium.
I'm frugal too and bulk reef supply is cheap and you know what you are getting. I ordered mine like 3 months ago and haven't even used 1/4 of what I bought and I'm dosing about 20 ml a day.
Just my observation. I could be wrong though