Reefcentral has some articles on this.
It is indeed fine to use epson salt. Some use it as a drip, others as an
additive. Right now, reefcental is down, as well as the temp forums...

HTH
Mc

"kryppy" wrote in message
...
Title says it all. Been thinking of blending it with RO/DI water for
some home made Mg up. Is there a formula, or is there other things in
the mix I am not thinking of that would be poison to a reef?
I figured I would test it for copper and phosphates..anything else bad
that might be in there?