Hey so im setting up a 20 gallon saltwater tank. Im an experienced freshwater keeper but new to salt. I have done some research and overlooked one thing. I bought 10 lbs live sand and 5 poudns crushed coral as a substrate. But the crushed coral is going to seperate and sit ontop of the live sand. I didnt really think about this at the time. Will this be a major issue, should i scoop the crushed coral out with a fish tank and only use sand?