I have a Vortech MP40Wes on my 57 gallon tank which I run on the Reef-Crest and Lagoonal random mode. I hear the pump ramp up and down throughout the day. I'm afraid of burning out the pump if it runs non-stop. I put it into feed mode in the morning and at night to give it a break. My question is, how often do you guys completely power off the pump? Is this necessary?