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you're not stealing the thread -- this is valuable discussion material (to me anyway!). i'd be curious to know that, too, as i think i'd be able to find epsom salt today. the seachem product is the only one i know of that i can find locally today (may be others, but i'm not sure). i was concerned about using epsom salt because of the buildup of sulfates, but, like you, i'm not sure of what the downside of that is.
i did see in another post where Randy specifically cited Seachem not being ionically balanced as a reason to avoid using it.
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