Skimmer Troubles

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This isnt the first time its happened, it happened 3 or 4 times before, i dont use any water conditioners, other than the usual, idodide, mag, dkh, stront, etc, i feed new life pellets once a day, and mysis and brine once a day. and i dont use any medications. And no there are no dead bodies, is it the food? And if so is it normal practice to unplug a skimmer during feeding? if so, how long. When i do feed it seems the water level in my skimmer goes down to nothing...