skimmer on biocube ?!?!?

[ronin_man]

can someone please explain how a skimmer fits onto a biocube?
i dont see that there is room for one, yet i hear alot of people use them with the cubes.

pics would be great, thanx in advance

 

[Stingray12]

go to www.nanocustoms.com and check out the sapphire skimmers