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I run two Mag 9's on a 180 with two overflows, and although it's never going to be "silent", it's not too bad. Is there anything impeding the flow after the durso, i.e. elbow's or other fittings?
Definitely and unconventional idea, but why not mount a couple of LED strips along the sides of the tank. You would have to use your imagination and McGyver skills, but might be interesting.
I did an analysis of both the Red Sea and Salifert kits for the Alk, Mg and Ca, comparing both cost and accuracy here:
http://www.njreefers.org/showthread.php?75413-Salifert-VS-Red-Sea-Reef-Foundation-Pro-Test-Kit&highlight=salifert
and have been using their Nitrate test kit once my Salifert...
This Blue Millepora is about 4" across. $60.00
Picture taken under T-5's with my Canon p&s.
These Jason Fox Setosa's range in price from $10.00 for the smaller pieces to $50.00 for the largest(about 2" x 2")
Picture taken under LED's with my Canon p&s.
When was the last time you calibrated your refractometer? Did you retest your Ca? What was your Ca, the last time you tested? Have you added any supplements since then? If your salinity is indeed too low, I'd just start topping off with SW, using your make up water, until it's back where you...