This is the first sump I have made, and it is a fun and easy project.
The skimmer chamber is 9" X 12" X 9" giving me about 4.2g.
The return pump chamber is 6" x 12" x 6" for a total of 1.9g
The refugium chamber will vary depending on the height of the water line I choose to run it at but the base will be 15" X 12" X 6" for a total of 4.7g
Like I mentioned, I will probably run the fuge and return pump chamber at 7.5" instead of the 6" that the last baffle is at. I will use the gutter guard to keep macro algae away from the pump. This will give me a total volume for the fuge/return pump chamber of 8.2g. That added to the volume of the skimmer chamber will give me a total sump volume of 12.4g. This is just under half the total 29g of the tank. The frag tank is about 23g, I feel very safe and comfortable with the room left in the sump for the back siphon. No floods are going to happen here (I hope!!).
Here are some pics of the sump build.
I taped the baffles in place then taped the tank to try to get a little cleaner silicone lines. It work out just okay. I would have liked to have some cleaner silicone lines, but there is limited space to get the tube in and apply the silicone.
Next up will be the planning of the plumbing. I hope to get a few things done with plumbing this weekend. I am thinking about using a combo of PVC and Spa Flex PVC. I want to use a true union ball valve from the overflow (it will be just a simple stand pipe) to the media box.
I appreciate any comments or questions.