you need a gushing power head with the output near the water surface so the food will always be pushed by the flow to the other end of the tank where the P's can easily get it. i also use floting pellets as primary feeds for my reds.
I do not bother with it - eventually it'll break down to pieces small enough to be sucked up by the filter. A few small pieces of food decaying behind a filter certainly won't pose a threat to fish in a healthy tank environment (cycled, clean water, well-balanced, etc.).
*Moved to Equipment Questions*
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