I bought a used RSM 250 and really like it, but I could never get the skimmer to work properly. I replaced it with a hang on back model and that freed up a lot of sump space for a reactor, etc.
now the skimmer, pretty straight forward on this. it just has an awkward design. if you saw the video in the earlier post, you'll see that it has almost a 45' angle on it which turn, takes up a ton of valuable real-estate in that rear chamber.
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its impossible to clean given its shape so I did what I could, I plugged the pump in, it turned on and that's that for now. if I don't like the skimmer, I may look into maybe one of those ghost skimmers (I dunno)