Well I've started to get my fish room going, and will more than likely be posting a build thread. For now though, Ive been thinking all day and night for the last week on ideas on how to setup a easy, fast, and efficient way to set up water changes. My new setup is going to be a 180G upstairs, plumbed downstairs into the fish room. In the fish room will be 2 40 breeders, and a 75G sump, plumbed into the 180. I will have 2 65G water storage tanks next to the system, one with RO water and the other with mixed water ready for water change. I'd like to hear some ideas, and would especially love some pictures, from others with fish rooms and how they go about doing their water changes on big setups. I've narrowed it down to the idea of drilling a hole in the side of my sump, and running a pump to pump water into a 35 gallon trash can, with a valve at the bottom to drain the old water. Then I will have a pump inside the 65G fresh saltwater to pump water back into the sump. I will have float valves on the sump, and in the trash can to monitor and shut off pumps when x amount of water has been removed, as well as added. I'm defenetely curious as to what others have done though, so I would LOVE some feedback!

I use a liter meter III. for my auto water change system

Holy crap I just googled that and I've never even heard of it! Wow that looks awesome. It doesnt say anything on the site tho about how fast it pumps water. How many gallons/how long does it take for you to do your water change?

Following along on this one. This is something I have been very interested in doing.
If you get something worked up please post some more details.

you can adjust the liter meter for a specific flow rate, usually rated in ml/min, very slow water chaning system, works great for keeping parameters constant and not shocking the system. I think with an APEX and a timer you could set up something similar using a couple of perisaltic pumps from BRS. Hell you could make a drain overflow in the sump and just pump water in and rely on the overflow to see it's way to the drain.

i was looking at this extra hole in my sump and was thinking about putting a ball value on it and have a hose ran to my floor drain in my fish room but not sure how to match the out going flow with my incoming RO / fresh saltwater mix. That's my only issue but would love to automate this one day once I get my ReefAngel.