[gene4213]

How to set up a spray bar???

What should I take out and replace in the back chambers???

Is it easy to replace the standard pump with the MJ 1200???

What skimmer can I get and will I be able to completely close the lid of the aquarium???

I was reading around and I saw who covered some of the entries that the water goes through to get to the back chambers, Is that a good idea???

[glampka]

Spray is rather simple to set up - get a piece of pvc pipe that will fit over the output of a ph, drill holes in it, cap off the end, attach the ph & you're set.
Take out the bio-balls & ceramic rings if keeping a reef. You can keep the carbon if you like.
Piece of cake to swap out the pump with the MJ.
Don't think there are any skimmers you can get. Sapphire used to make them but have recently suspended manufacture of them. Don't waste your money on the Fission.
You probably have 3 inlets for the water to get into the back chambers - top, middle & bottom. It's a good idea to block off the middle & bottom. This forces the water to go through the top skimmer. That way you'll be removing the surface garbage.

[kmcginnis]

I found a Sapphire and it fits fine in my chamber. Maybe you can call around to your area LFS?? That's how I found mine!

[Marine1]

Oceanic makes a nano protein skimmer for their bio cube, but I don't know if it will fit in yours.
Oceanic BioCube Protein Skimmer | Pet Solutions