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#13
06-11-2013, 03:07 AM
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when you dose, don't forget that the total water volume is different than the 'for every 70 gallon' rule. You must consider water displacement! If you were to take all your rocks out, then add the water volume of your sump as well, you might get a different number. I'm sure you know that, but - a lot of people forget that part!
What are you using to test mg? 
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