I plan on setting up a 40 gallon breeder display with a 20 gallon long sump and CO2 after the holidays. I have long been debating on using a sump instead of a canister, but after a few months of having a diy 10 gallon wet dry on my turtle tank the ease of maintenance is awesome. I will be doing a herbie overflow to keep it silent and help reduce off-gassing of CO2.
My goals for the sump
-a place to store all equipment
-refugium for fry/shrimp
-reduce CO2 offgas as much as possible
Here is the design
Details about design:
-Herbie overflow will be hard plumbed using 1" pvc
-Baffle 1 is 9" tall
-Baffle 2 is 8" tall
-Baffle 3 and 4 are 8" tall with 1" gaps underneath
-Baffle 5 is 7" tall
-The fluidized media will be Bioflo (similar to K1 except it's made in the U.S)
-The return pump will most likely be a Rio 1700 (642 GPH)
-The refugium will be about 12" wide but everything else is subject to change
A few questions:
I don't recall ever seeing a fluidized media section in sump on a CO2 injected tank so I'm not sure on whether or not the flow from the sump will be sufficient enough to fluidize the media. If it isn't, I could add an air pump and some kind of top that would rest on top of baffle 3 and 4, but then I would probably have trouble with CO2 offgas. Would having the flow go over baffle 4 and under baffle 5 create more turbulence? Should I add another baffle after baffle 3 to force the water to fall on top of the media? Should I scrap the fluidized media idea?
Let me know what you think. Flaws, improvements etc.