Main display tanks are a 125, 40breeder, and a 20 long that replaced a 50 gallon that leaked on me. Almost three years later and I still haven't trimmed the front.
Behind the scenes are another 20 long with live rock rubble to gravity feed pods into main 125 display. Below that is a 20 high that is a deep sand bed and macro garden that falls back into the sump. To the right of that is the CS2 in question. It's about 6-7 feet to the right of the sump and approx 18" above the sump water level.
The sump is a 75 with about 20lbs of rubble. I just swapped it in place of a 55 on Saturday and skimmer output has increased a bit but quality of foam seems better. More stable at least (dryer & fluffier) without any adjustment. This is what promoted me to post. I just don't think I'm getting the most out of the skimmer. Btw, I've never had a problem with this skimmer. Overflowing, constant tinkering, or anything else people typically post about skimmers.
This system is very lightly stocked at the moment. 9 smallish fish total.
Here's a list and a few pictures.
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125G: 5 small fish. Pair of juvenile false percs, purple firefish, royal gramma, a potters angel, and the coolest long spine urchin (thanks Pants)
40B: yellow tail damsel, dwarf hawkfish, and a neon dottyback.
20l holds a Condy and it's host Clarkii (the odd couple!