I am in the process of shutting down a 40 Gal reef and will be removing the last two fish in the next few days. When done, I will have no need for the CPR bakpak hang on skimmer on that tank. It is a little beatup/worn, but I just replaced the Rio 600 pump on it. It will require a good cleaning, but the unit works fine.
I will give it to you for $65 plus shipping. That is half the retail price.