I believe in, the bigger the better when it comes to refugiums. What I do is make a sump as large as possible, put partitions in it as I want them and incorporate a DSB in the largest chamber and use that as my refugium. Because you are planning on housing planktivore eating fish you need to concentrate on having enough space to grow the plankton. What I do is have a designated area in the sump/refugium and put small shells there for the little critters to grow out to maturity, breeding along the way and growing in numbers. They will make it up to the tank through the pump. Some will not make it through the pump alive but enough do to populate the tank.
Here's a link to my tank thread - http://www.talkingreef.com/forums/showthread.php?t=412 - Surf through there. You will find the info on what I'm refering to.
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