I make a new batch when I use the one I made at the last water change. I don't add the ca and mg until I use it as I find it ends up with a lot of precipitation if I add it at the same time. I plug my heater in the day before if it needs it.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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