I set up my new system about 5 weeks ago now. It's a 230g euro braced tank(open top) with a 45g rimless frag tank to the same filter. I have a 10g ato reservoir. I'd say the tank is going through the 10g every 2.5-3 days. Seems like a lot to me. I've checked multiple times for possible leaks. My Red Sea reefer 450 I'd say goes through a gallon a day so maybe it makes sense this burns 3x as much. Seem right? What does yourtank use?