I just looked these up and it seems that they make versions for both fish only and for reef tanks. The bak pak 2 says it is for fish only and the 2r is for reefs. The only difference I can see in pics is biobail is used in the 2 and not in the 2r. So if it is just the 2 then probably remove the biobail and it should be just like the 2r. CPR is known for good products. I do think however this design is starting to get a little dated but it is said to work. I guess this is one of those if it aint broke why fix it kind of designs.
I did find this list of pros/cons :
PROS:
New and improved models are continually released.
Combination protein skimmers and biological filters.
Simple "plug and play" installation. Cons:
Require regular maintenance for max performance.
May produce excess bubbles in return flow.
More expensive than most other skimmers.
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