Hello ! I have moved my Red Sea 250 tank yesterday in another location. The sand is still in the tank with the criters and about 60 liters of new salt water( added today ). I want to add another bag of Carib Sea Arg Special Grade live sand. Would be a probelm if a just add the new sand on top of the old sand ? Should I rinse the old sand before ( I allready have 60l of water in the Tank)