Can you post a couple pic's of it and the parts, if they are not attached or being used. I use to have a RS180. RC means recirculating, so if you have a second pump attached to it, then it is a RC, otherwise RS.
Should be simple, its a matter of adjusting the air flow and water flow. What most are missing are air adjustment valve. If you don't have one, then you can probably get one from Kevin @ Red Coral or JL online.
If the skimmer has been running for a bit, great... It will be a matter of getting the bubbles as fine as possible, using the air adjustment. Then adjusting the water level. I use to run my water lever to the base of the skimmate cup.
I hope this helps.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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