EShopps Sump

I am building a frag tank. Bought a used EShopps RS-200 cheap at my LFS. Went in looking for a used tank to use for a DIY, but like I said, the EShopps was cheap.

So my question is would it be better to stick a divider in there to make a small fuge, or should I get a 10 gallon or so plastic container for a bigger fuge? Is bigger better? My thought is to set the fuge container on a platform so it sits higher than the top of the sump. Then let it gravity feed through a small bulkhead and pvc into the sump to go back to the frag tank.

I hope I explained my thoughts well.

 

More water in the system, the better. Like the idea on the design with the 10 gallon fuge.