6 days old isn't fresh it is aged new water... the problem with IO is if you measure it befor it is totaly desolved.. once it is a day old I have always gotten true readings. but there were thoes bad buckets about 7 years ago which had huge alk and wipped out tanks, but seeing your readings thats not the issue.
you high alk is depressing you Ca level and because your Mg is a tad on the low side it is making it hard for your Ca to come up to offset your alk. I would sugest raising your Mg to 1350 befor you add Ca. you will notice as you raise your Mg you Ca will increase a bit also and your alk may drop on its own as the Ca comes up. once you have your Mg at 1350 wait a couple days for everything to stabalize and raise your Ca to about 400. then check your alk and there is a good chance it will now be well under 13.
Steve
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Last edited by StirCrazy; 06-13-2009 at 03:05 PM.
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