JG24
Yes I have two of the CPR SR2 currently running. One in my 55 semi-reef, the other in my 30 semi-reef tank.
I had the CPR Bak-Pak II in the 55 for over a year, but liked the performance of the SR2 insump unit better, so I bought another one.
The Bak Pak II is now on my 10 gallon mini tank.
If you want to see it check out my site - go to INFO button for the 30.
I have removed all the blue bio media since there pics were taken, and I'm very slowly removing bio media from all reef tanks filters.
Good luck - I am so pleased with the CPR protein skimmers, I bought 3 of them so far ..... Brian