I am going to be out of town for about 3 weeks. How long should I push it before my fish are fed? I have a Clarkii clownfish, Bi-color blenny, and neon dottyback. I've been trying to feed them a good variety of foods to keep them healthy. All fish are in tip top shape. I have timers for my lights so I'm covered there. I am also going to set up a top off system for evaporation. The tanks are 20 gallons and 10. How often should I have someone feed them? How long can fish go w/o eating?? Any help would be appreciated. Thanks!!