You'll want to raise it higher -- shooting for 1.025
The easiest way to do so (must be done gradually) is to use saltwater instead of fresh water to replace evaporation.
I was using a Deep Six, and was none too thrilled with it. I just replaced it with a refractometer -- well worth the 50 bucks -- incredibly accurate, a snap to use, and no more uncertainty.
Acrylic, 250 lbs Fiji/Tonga mix, 3x175 watt MH
& 2X96 watt PC
, 1/5hp Arctica chiller, EV-180 skimmer
Brown Tang, mated pair Clowns, 4 Fire Gobies, 13 Chromis, Orangespotted Sleeper Goby
Some corals and inverts yet to be identified!