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I wouldn't be too worried about magnesium at that level. Though a little high I don't think it can really hurt anything. Have you tried testing your freshly made water to see what the magnesium is? @redfishbluefish or @downbeach may be able to help out a bit more with the chemistry side than me.
I use them 2-3 times a week. I cut a little chunk off and thaw in a cup of tank water. Once thawed I stir it up really well and then use a pippet to remove the bigger chunks of the egg sack and mix with LRS and PE mysis. I have been a bit lazy and not removed the egg sack chunks and the fish...