David, what type of critters are you planning in that tunnel? Micro feather dusters would be cool, though I would be concerned about reducing the flow through there.
Also the skimmer chamber, you must have a very specific skimmer in mind to fit there?
Mike,
Feathers and sponges are my intent. The size of the chamber will keep center open for flow...frequent maintanence checks when changing FSs. I have a 3" brush I plan on using if any issue ...I will think positive
I am using Salt Water Connection SWC160 love this skimmer!!! Outperformed my Bubble King Mini 180 on my old DT