I have a basic question, I'm going to be putting a Refugium at the bottom of my 29gal tank and I was wondering how do I do a water change? Do I turn off the sump and empty the main tank or empty the Refugium. If I emptied the refugium wouldn't it in-turn empty the main tank?
What I usually do is pump about 5 gals of water out of my sump into a bucket.. empty the bucket and pump 5 gals back into the sump.. It doesnt touch the Fuge nor the tank.. When i take 5gals out of my sump its just enough to still cover the pumps and I unplug the heater so everything seems to be great.. that way the water still gets evenly mixed with the tank water..