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Fluidized bed sand filters are soured 24/7 and are still the best filter/footprint around because of the huge surface area. So don't worry about over cleaning.
If you check, you will find most of the old timers backwash daily. Of bourse the don't used it for bio filtration.
Grant Fugita, a world respected dealor and now hobbyist will say to flush your mechanical filter as often as you flush your own toilet. I know that means weekly for a few of you but few people understand how seriously Grant takes it. He flushes his filters at least twice a day.
Think about it. Your fish dumps. That material is a tremendous amount of nourishment for bacteria and will allow hetrotropic bacteria as long as it is available to them.
If you're dumping every now and then, increase your backflushing and watch your ORP.
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