Hi All,
I was able to get the best of both worlds: surface skimmer and fission protein skimmer installed in my 24g JBJ Nano. I moved the protein skimmer to the middle compartment and was able to get it to fit. It's a pain though changing the carbon, because the carbon bag now sits underneath the skimmer, doh!
To help reduce the amount of air that gets put back into the aquarium I put some filter media in between the protein skimmer and outlet of the sump. The filter media can be bought for about $5 dollars at the LFS.
It's s very important that the protein skimmer be installed at a certain level above the water. If it's too high it will not capture much protein. If it's too low its container will fill up very quickly with almost all water. Please refer to the skimmer manual. The manual gives a nice diagram of where it should be placed above water level, but I imagine you will want to experiment yourself with the placement level. I noticed from my own testing if its too low the container fills up in 2 to 6 hours. If it's the right level it should fill up in about a day depending on bioload.
The protein's skimmers container feels up very quickly in my tank. I have to empty it once a day. I am guessing due to my tanks bioload. It does seem to be mostly water too, which is disappointing, but my tank does look better since I installed it (more coralline algae and corals look healthier) so it must be helping. For example, I used to have to clean the algae off my tank's glass every 2 to 3 days, now it takes about a week for the algae to be noticeable on the glass.
skipm is probably right though, this is a baindage for bad husbandry, but at least my tank looks good. I wouldn't recommend removing any filtration you already had either. The skimmer should be an addition to your filtration, not a replacement. Meaning keep your carbon, sponge, other filters you already had in place. The carbon helps in removing any poisons in the tank such as amonia and heavy metals.
To help others with the setup, I've included a picture below.
Fission Protein Skimmer Installed in Middle Compartment in JBJ 24g
Scott