your probably going to want to find someone with a refractometer to do some comparisons, it's possible your
hydrometer is just reading high.
FWIW I run a system at 1.029 constant with no ill effect, in fact it's amazingly stable. The average is around 1.026-027 and not the 1.024-025 that most think of, reasonings for lower salinities date back long before I was reefing with the thought that it lowered metabolism and activity of inhabitants to help control the environment.
Long story short, so long as the parameters change slowly and not abrubtly almost all inhabitants will deal to a great degree. We're dealing with something that is in fact naturally occuring in the wild (salinity and temp swings both).
I'd look at why the
sg raised.... do you use a pre-mixing bucket thats heated and may have experienced evap?
did your
hydrometer take a bump that affected the weight of the swing arm?
did you change salts recently and are still measuring the same amounts when you mix?
are you topping off manually or automatically, the same amount on a constant basis?
did you top off BEFORE your water change so that your not making up for top off with new
SW?
I've experienced
salinity changes with ALL of the above definately look at investing in a refractometer in the future or at least checking your
hydrometer against one, it's a great help
salinity 
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Thats funny. I dont think I have ever laughed so hard great post thanks .