OOOOPS, clumsy fingers. Sorry man, I meant 1.023 - nearly gave you a frightTobes - 1.030 is FAR too high - perhaps this is the cause of the whitespot. The ideal SG for corals is: 1.025/1.026. For fish can be lower (reduces stress).
So, perhaps remove some tank water and replace this with RO water. Repeat this over a period of say 6 hours or so.... until your SG is +-1.025... Then wait a day or so and see how the fish reacts....
And NO - do not do a water change now....
Hypo-salinity treatment works great in a tank without corals, but is not recommended if you have any LPS or SPS corals. If you do have corals, you're basically stumped, and all you can do is to feed the fish well, and prevent stress (perhaps reduced lights for the next few days...). If you don't have corals or other sensitive inverts (e.g. snails), you can reduce the salinity to about 1.010 and keep it there for a period of not less than three weeks.SLOWLY decrease the salinity of your tank water (if it is not already at this level) to about 1.020 for a day or so
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