Wow again I thought this was a basic husbandry type issue, reefkeeping 101 so to speak. I guess it need to be brought up from time to time for all of the new people and yes even for those who get carried away and forget. The basics to me are.
Turn off all filtering - overflows to sumps etc when feeding. Most do leave internal flow pumps on to make the "bait" - food - more attractive to the fish, and circulate the smaller particles to the coral so they can "eat" too.
Feed no more than can be eaten in a minute. Then feed again, no more than can be eaten in a minute, until you feel you have fed enough. The idea being little to no food falling to the rock and substrate.
Keep a good clean up crew for the stuff that does get away and the waste produced by the critters.
Ensure adequate flow to the substrate, rocks, behind the rocks, to try to keep detritus and uneaten food suspended.
Clean the filter materials on a regular basis so that they do not become a major part of your biofiltration.
Sump pumps and filters back on when the food is "gone".
The old car company adage about quality at the source applies here too. If you keep from adding those things that become mistakes down the road, you don't have to come up with the fixes to the symptoms that result!!!!
My input for what it is worth.