Altohombre
The Tennis Pro Reefer
what is the advantage of dry skimming other than pulling less water out of your tank? Seems like wet skimming would pull out more crap even if its watered down more.
and you change this by adjusting the o-ring?
It depends on the skimmer. Most better skimmmer are adjusted by raising or lowering the return stand pipe out of the skimmer. The CSS has a red knob (as Dustin mentioned) that raises/lowers the water level. I don't know of any skimmer that has an air adjustment dial, but some lower quality skimmers might.and you change this by adjusting the o-ring?
It depends on the skimmer. Most better skimmmer are adjusted by raising or lowering the return stand pipe out of the skimmer. The CSS has a red knob (as Dustin mentioned) that raises/lowers the water level. I don't know of any skimmer that has an air adjustment dial, but some lower quality skimmers might.
Alto you asked about an oring, some skimmers have an adjustable collection cup with an o ring type thing that just keeps it in position. Is that what you are asking about? If so than yes that would be how you adjust it.
That's how my Aqua C Urchin Pro is set up. But I can't get a dry skim out of it so far. Just a dark to medium brown wet skim.