ok, need some more info ont he tanks, what is in the ones that are good and what is in the one that is bad? (coral wise) also is there a sand bed in each tank and is it the same in each tank. are your Ca and alk the same in all 3 tanks? oh and is the low tank a new tank?
don't worry about the 24 hour mixing, as long as you are mixing it good it won't make a differance like that. and as long as it is mixed to the desolving poing it doesn't matter if it is 5 min or 5 days. once it is desolved it is desolved. I mix for 5 min with my drill propeller and then let the mag drive go for another hour. but after the 5 min with the propeller it is good.
I found DSB are good for sucking Mg out of the water. never had 1/2 the work to keep up Mg when I went bare bottom.
Steve
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