I usually run the water levels in my third chamber 1 inch above the maximum line, yesterday I removed the grate that seperates the top and bottom of the first chamber. This morning I checked my tank and my water levels are 4-5 inches higher in the third chamber. What could have caused this. I doesn't make sense to me that removing the grate would do this. My pump is working, is It possible it slowed down? we did have 3 power failures last night. what should I do?