What range do you aim to keep your nitrates at? I know the preferred range is 1-10, but 1-20 is tolerable. I have both fish and coral (softies and LPS’s). This the first time after a water change that my nitrates did not go down, they actually went up. So I’m not sure if I’m possibly overfeeding or maybe had a bad test. I changed the water last night and tested parameters tonight. I used new reagents for Hanna nitrate (high range). Just wanted to get an idea of where most of you keep your nitrates at…and do you use this as a guide to determine when a water change is needed; or do you stick to regular scheduled water changes? I have been sticking to a schedule of 15g every 2 weeks, regardless what the nitrate is. Maybe I’ll retest just to double check.