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I have PFS and it settled so fast. I had to take out 75% of water when I put it in, so when I was done filling up the tank I turned everything back on right away and had no problems. As long as it's rinsed really well you shouldn't have any small particles left. I've also got 2 aquaclear 110's with 3 extended intake tubes so it's about 2-3" above my sand, but like I said I didn't have any problems.