You have to tune you filter socks based off you nitrates and phosphates. 100 micron is great if you have really high levels switch out more often. Lower levels. You can go up to a week. Then it all comes down to what your coral consume. If you strip your tank of the the nutrients the coral will suffer. My heavy stocked tank of sps, LPS, and softies I ran 20 nitrates and and little bit of phosphate..10