My tank took a really long time to clear up. I forgot to rinse my sand before putting it in. What size is your tank? Do you have a sump? I found that pointing my powerheads towards the overflow and increasing the rate of my return pump helped clear up the water faster. As far as you salinity going up a bit when you added the LR, how much did it jump? And yes you can add some freshwater to level it out.
HTH
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