thats even worse, everytime a fish decides to swim fast, its gonna kick up a HUGE SANDSTORM, for my cichlids i alwasy wash Crushed Coral, ur best bet is to eithor take it out completely
because in sw tanks it holds nothing but debris
or if you want to keep it in, Rinse it until it is almost clear, considering it looks like milk when water is first added.. Good Luck! its going to be a pain in the Bottom, but its necessary