One of the problems I've run into is that size of the 1st chamber on my sump.
On the recommendation of a local reefer, and because of space limitations & wanting to have a 'fuge, I built my sump from a 29gal tank.
The 1st chamber is 5-1/2", which is too narrow for almost all in-sump skimmers.
Most are 6 to 6-1/2" at the narrowest and so I can't cram them into my sump.
The final chamber is bigger, @ 6-1/2", but its got the return pump and heater.
The other thing that is not so good is I didn't build the 1st chamber with an overflow partition - its an underflow/bubble-trap; translation the level fluctuates with evaporation - As I understand it, not so good for most in-sump type skimmers.
As it is, I ended up putting the skimmer body in the second chamber (3"), but it feeds/outputs in the 1st chamber.
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