Spose it depends on what you are feeding and what fish you are feeding it to.
I bought some frozen bloodworm last week for the first time and just let it thaw in the cup i use to soak dry food then droped a bit in the tank at a time. I find th efish i have like a midwater food so eat it as it falls and dont seem to feed in the gravel so prefer not to let it get there before its eaten.
well turn your filter off for ten mins, so a bit of maintenace theres an idea, put a block of food in turn off filter, remove a jug full of filter water, dismatle filter and rinse out sponges, put back together filter and most of the food will be eaten or sunk in the gravel for your bottom feeders. di