I have two, I've been running one for 6 months and its pretty good, and I just picked up a second one for my new tank build. Smaller skimmer, the one I've been running lately is a NW-200, and the new one I got today is a DUAL Recirculating DDNW-250. Both mine came to be second hand, so I'm sorry I don't know where you can find them.
Downside of the NW-200 is that it needs a bit of a kick start to get going, you need to actually start it going by pushing air into the body. I'm not sure if this is normal on all of these skimmers.
I know nothing about the DDNW-250 other then the fact that it is a huge monster-like beast!
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