Berlin HO Skimmer???

[canadawest]

Calling all Red Sea Berlin skimmer users, past or present!!!

I just replaced my little Prizm skimmer with a Red Sea Berlin HO skimmer powered by a RIO 2500. I got the used skimmer and pump for only $150, so I figured it was a good deal for an upgrade.

Anyways, aside from being leery about the RIO 2500 pump, I am concerned with the output of the skimmer thus far. I do know that skimmers require a break-in period, but how long is it with the Berlin? So far I barely get any foam out of it, and this is with the airline and pump running wide open for the past 18 hours. The skimmer was pretty clean so I suspect that it does need to get a scum coating before it really produces good foam, but I am wondering what other's experiences are with this skimmer?

Anyone with tips, tricks, or anecdotal experience with Red Sea Berlin skimmers, specifically the HO model, please PLEASE let me know!