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Kev,
I have a 425xl which is probably slightly bigger than your tank, not by much though.
I have an mp40 on one end and a ow-25 on the other end. I'm trying to get my hands on a second mp40 to replace the ow-25 but I find that the mp40 on 50% and the ow-25 on 100% produces adequate flow. My...
I also read his latest posts regarding mag and now our hobby grade test kits are not great at resting for it and we could be having false lows and false highs
What mag test kit are you using ? That's an insane drop off and no way your tank consumed that much. The levels of calcium/alk would not effect the mag that drastically.
Maybe grab a second mag test kit ?
Since I am home with the birth of my newborn, I took a trip to Reefco today, they have healthy cleanup crew and a abundant amount of them. Yes, reefcleaners is cheaper, but these inverts were also much bigger. If they are in your area, highly reccomend.