hi there. I am also looking for sump designs. I can across this cool design from BRS (http://www.bulkreefsupply.com/aqueon-modular-proflex-sump-filtration.html). Cost to singapore definitely huge but I think most tank makers here can make similar. I'm thinking of DIY one for my next setup.
i tried using frozen brine shrimp and based on what others say here, i don't think it works. Maybe some dragonet different personality one. haha
Niway, I am cooking live brine shrimp see if it works.