How to use protein skimmer?!

I just got this for free and it's a lot bigger then I was expecting. They guy didn't tell me how to use it and I have no clue where to begin. Please help. Also I have a 40 gallon cube tank and I'm scared this monster Will break the glass!

 

wow - that is huge! It looks like it's a double of the kind I had - You would hang it on the back and plug it in - I would probably try to fill it with some water because it's going to pull water into it and then create bubbles in each side and you'll need to watch the cups and make sure they don't overfill - I'll let others chime in but I think this beast is probably too large for a 40 gallon. Is your cube rimless? If so, I probably wouldn't try it at all.

 

Man that's a shame. I mean the thing was free! It's not rimless but i still would like others to chime in too.

 

is there a way that i could just use one side? if not i have no problem building a little platform for the protein skimmer. i built the tank stand out of thick pieces of wood

 

Is your tank up and running? I didn't see picks of that.
I don't think it will break the glass.
Look for a nameplate or tag and google it.

It's a HOB=Hang on back model, so I'm guessing you don't have a sump?

I/We'd like to know more about what you're putting in on and some pics would be nice too.

 

well the tank is currently freshwater. i can post some picks soon. from what i understand its a reef octo hb300.

 

Looks like a CPR Bak-Pak Dual.

https://www.youtube.com/watch?t=25&v=jCZCpXVubWo

 

its this one
http://www.bulkreefsupply.com/reef-octopus-dbh300-dual-hang-on-the-back-protein-skimmer-1.html

 

Freshwater tank DON'T use them, or so I read?

 

lol no your right! it is currently a freshwater tank.