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Rubble is the best way to go.I will take a shot at this...
From left to right... The return pump chamber is pretty straight forward. If you want, you can get other nubs to be able to angle the return line. The 8" chamber is essentially a refugium; I would fill it with rubble, but if it came with the bioballs, then that should work just fine (but you might want to look up how to care for bio balls). The right-most chamber is the basic overflow; this is where I would put the heater, and possibly one of those mini glass nano skimmers....
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I hope that helps... Otherwise, can you be more specific?
Welcome aboard. I have one I dont need for the Coralife Biocube 29 if thats what you have. I belive they're different from the Oceanic Biocube so you'll want to be sure. Used it for about 2 months before the 32 gallon version came out. $30 shipped
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the 32 is great!![]()
The media basket dont fit these? I know they are a bit taller but side to side is the same footprint.

