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The Eheim they sell is the one they use for the RC250. Those skimmers don't need as much power. I was sold the Eheim because I thought the OEM Gen-X was too loud. My tank's in the family room. Unfortunately, output's not the same. I'm waiting for ER to come out with a newly designed part (forget which part) for the Gen-X which should quiet it down. They're expecting it end of December. I hope it quiets the pump down enough because I'd like to use the bigger pump if possible.
Right now, I'm getting skimmate with the Eheim, but it could be better. The advantage with the Eheim is that it's almost silent.
I think the Eheim would be a good match for your RS180
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