When doing water changes do you...

[new but handy]

Originally Posted by mark

I change out about 100l at time.

-First is I'll close the valve off the return pump so don't drain the display, then turn off the return pump
-siphon ~60l from the display focusing to get any settled detritus
-open valve and turn return pump back on to get the corals back under water, then valve closed and pump off
-siphon the remaining 40l from the sump and fuge
-transfer the new 100l to the sump turning on the return pump after added ~50l

your display drains without a pump running?
Or does it just drain a little

[mark]

Originally Posted by new but handy

your display drains without a pump running?
Or does it just drain a little

The return line (from the pump) is a couple of inches below the water line. My sump can easily handle a power outage, just go through this extra bit during a water change to hold the volume in the display to lessen the time corals exposed to air.