No pics I'm afraid. You can just drill the back if that's easier, but my skimmer design needs an active feed into it, so unless you can make it a HOB, you are out on your own for DIY skimmers I'm afraid
Duroso in this context is a modified version of that in the link The air vent is shut, and the thing extends back towards the bottom after the "bend" at the top to draw in water from the bottom that's free of larger air bubbles from the water going over the weir combs. This will not drain the weir if the valve is correctly set, but if it's alowed to suck away freely, the weir will drain, the duroso stall out, the weir re-fills, the duroso starts to syphon again e.t.c. If its shut too much, too much water goes down the hole at the back, making the system noisy through the back hole sucking in water under syphon...
The second hole I mention is in the display tank, yes
Ive decided to go for a ready made off the shelf skimmer.
As if i buy one it will sit in the sump and i wont be able mess it up (i hope) i am also limited for space under the tank going for the size sump i have chosen. So now i wont need the 2nd hole to feed the skimmer?
do you have a link for the duroso? i couldnt see it on google (only had a quick look though as im reading up on buillding sumps)