OK WELL IT APPEARS I HAVE LOST ALL OF MY FISH DUE TO NITRATE PROBLEM.NOW HERE IS WHAT I WOULD LIKE TO KNOW:I HAVE A UGF WHICH AFTER MUCH ADVISEMENT I WILL REMOVE.WHAT I NEED TO KNOW IS A)WHAT KIND OF FILTRATION WOULD BE BEST FOR JUST A CRUSHED CORAL SUBSTRATE OR B)WOULD IT BE BEST TO GO FOR A...