According to a thread on RC (do a search of Euroreef and Dolphin), EuroReef had trouble sourcing Sedra pumps from their supplier. So they temporarily substituted Dolphin pumps, which they claim are functionally equivalent but just with a different label.
The Dolphin pumps actually have a higher gph rating than the Sedras, I don't know if the actual gph is higher or if they just rated them higher.
Anyway I was looking for a CS-6-2+ which is basically a CS-6-2 with a higher rated pump (Sedra 5000 instead of Sedra 3500). So my evil plan was I would order and pay for a CS-6-2 but since it has a higher-output Dolphin pump I would essentially get a CS-6-2+ for the price of a CS-6-2. I'm waiting to hear back on my inquiries about exactly which Dolphin pumps come with these skimmers before I order one.
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