Depending on your desired bio-load for the tank, I wouldn't be comfortable with ONLY a HOB refugium based on my current experience with the two CPRs that I have now.
The shipped pumps are pretty low flow. I found cyano clinging to my chaeto tonight on the 65 gallon Aqueon tonight.
I'd much rather see that stuff in the refugium instead of the display, but seeing it at all says things are not very "clean".
At the very minimum I would think the versions with a skimmer would be important.
