I'm curious about about water changes in systems that include a refugium/sump. Those of you that have a refugium/sump, when you do a water change, do you:
1. Only change water in the DT
2. Only change water in the sump
3. Change some from both
4. If you change water in both, what percentages do you change in both and do you change both during each water change?
1. Only change water in the DT
2. Only change water in the sump
3. Change some from both
4. If you change water in both, what percentages do you change in both and do you change both during each water change?