reeftivo
Skim junkie
Mine runs with the water JUST below the bottom of the air intake chamber.
depending on bioload, some even operate well at 8 inches. A lot depends on the system. I had a light to medium load on my 54 gallon system so 9.25 was good for me and if i went any shallower, i would have to close off the standpipe too much for my liking. I have a little bigger system now and sold off or gave away most of my corals. Working on getting things built up on the new tank (5 months now). I have shelved my CO1 for now and I'm running a ins80S with sicce. nice skimmer!! Only thing i don't care for on the INS80s is the standpipe. Not too much fine adjustment so I have to adjust it carefully.