Fish tanks are kept at low salinity because it is more likely that fish won't develop disease because many parasites can't tolerate low salinities. They also do it to save on salt (in my opinion). However, corals do not tolerate lower salinities. I would keep it no lower than 1.023 or 1.022 if you're really that interested in lowering the salinity. There is nothing wrong with 1.025
Yes use prime (careful with that stuff, never overdose) and match the salinity and temperature to the water in your tank and do a water change.
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