the rock says....
most pet stores/suppliers keep their salinity low as do most hobbyists because it lowers the chance of diseases running amok in your tank. but a healthy tank with corals and inverts and healthy fish that is stable should be kept higher as it will contribute to the health of those particular items. i believe the salinity in the Red Sea is even much much higher if that gives you any indication, maybe upwards of 1.035. so there, lol, an established tank much higher and healthier, a new tank or a inexperienced person lower than 1.024 and keep trying, obviously we can never make our tanks as healthy as the ocean and that is why the levels are so high, because of the health of the ocean itself, so in our tanks it need to be kept lower