So im leaving for vacation next month and my main concern is the evaporation. The fish wil be fed but the sitter will not have time to top the tank off every day. The tank is a 60 gallon bowfront with 2 occelaris clownfish and a royal gramma baslet. The tank is sumpless and im just running on a power filter and live rock. Im wondering what the best method for an ato would be here. Im on a budget being i am only 16 and im wondering if there is a diy page you guys could point me to? Or what is the best option for an ato in a sumpless tank. Any info would be great.