When you have an overflow filter and floating food, turn the filter off, depends on my tank but with some tanks I turn the filter off b/c the food will get sucked into the filter.
Turning off my filter is too much work, as the cords are way behind a desk. I suppose I should, though, as it usually sends food flying all over the tank and scattered all over the gravel.
On.
Besides the same reasons already stated by others, I'm so forgetful, I probably wouldn't remember to turn it back on. Remembering to plug them back in after water changes is enough.