Here are the 2 mods I did.
1. Hofer Gurgle Buster
2. Return lines in sump.
I tried the durso-both the supplied one and 1 modified (11/4" and longer) but felt they were too noisy so I tried the Hofer and you can't even hear it. No gurgle and I was able to stop the micro bubbles with it also. I added some filter medium to stop the waterfall noise.
I was going to hard plumb the discharge and return into the sump but there is not enough room to do it neatly and out of the way. At least with the vinyl you can bend them out of your way if necessary.
I also didn't like the hose barb connectors with hose clamps (they will rust) so I used pvc fittings and glued them.
I still might hard plumb the system by going out and fastening it on the back but since I have added a Bulkreefsupply GFO and Carbon reactor that is attached on the back it limits my area.
The whole system is controller by a AC3 Pro. What I am trying to do is something similar to the following
http://nano.ereuland.com/
Have a look, it is with an older CAD but the principles are the same.
Notice how nice and neat the overflow looks.
Also the UV and heater fit really nice in there also. I opted for a DSB in the center compartment of the sump, not large but I can put critters in there.