i can definitely get the sedra 3500, that's not a problem, however i can't get the gen-x 2400.
to be quite honest i've never been a fan of the gen-x pumps. the impellers always seem to break and/or rust.... no good.
here is a convo from wetwebmedia discussing replacement pumps for your skimmer:
Euro-Reef Modified Eheim Pumps For Small ER Skimmers (Not Yet!) – 06/17/08
Hi,
<<Hello!>>
I have a question about the Euro-Reef RS100.
<<I am a huge fan of ER skimmers…I own a CS12=3 with ER-modded Eheim 1262 pumps, myself>>
I called them up and was hoping I could switch out the Sedra pump for an Eheim.
<<Hmmm…the RS100 uses a ER-modified Sedra 3500 pump…I believe the only ER-modified Eheim pump is the Eheim 1262…too much pump for RS100 skimmer>>
Since this pump performs much better and is quieter.
<<The Eheim pumps “are” a much better pump than many…agreed>>
I couldn’t get anyone over there.
<<Keep trying… I have chatted with these fine folks on several occasions…they were likely busy and just couldn’t get to the phone>>
Is this a possibility?
<<I’m skeptical (unless you can get a custom mod on a smaller Eheim model)…but you need to speak to the folks at Euro-Reef about it>>
Can you recommend an Eheim pump for this size skimmer?
<<Not with the required needle-wheel or pin-wheel mod currently offered by Euro-Reef and sized for their RS100 skimmer. You could try looking around the NET to see if anyone offers a smaller needle-wheel modified Eheim pump. H&S skimmers use such modified Eheim pumps…1260s I believe (and about $300 a pop)…but this is still probably too much pump for the ER RS100 skimmer. A needle-wheel modified Eheim 1250 is what you need to look for…good luck. Another option would be to replace the Sedra pump that comes with the skimmer with a needle-wheel modified Ocean Runner pump of comparable size. It will be a fraction of the cost of the Eheim (though I do like those Eheims!) and I find this brand of pump very quiet and reliable as well…though they are a bit bulky/large. Be aware, any pump you get that was not modified/designed/intended by Euro-Reef to be used with their skimmers will very probably require some modification/imagination to get it to “mate-up” with the ER skimmer (and will probably also void any warranties)>>
Thank you.
<<Good luck with your “hunt.” EricR>>