Let's say, I spill 8 Oz of hard pellet food. Every time I feed the 2 Oz , required by the fish to eat.
So I have 6 Oz of hard pellet food uneaten, and very slowly soaking up water. It will take about 8 hours before any of it is decayed into ammonia.
So in a 75 gallon display, being filtered at 750 Gph. Thru a 300 micron sieve filter. What percentage of 1/16" food pellets. Are still going to be in the aquarium water, and able to be decayed
When the 8 hour time it takes the bacteria to start breaking the food, begin.