I'm getting rdy to set up a 90gal reef and I need help setting up my sump. My tank with have a built in overflow and I'd like to keep the sump under the tank. I have an extra 30gal and 10gal with 18'PC. I know I should use these both in the set-up but I'm not sure how . Should the refuge. be higher than the sump? How do I make a bubble trap in the 30 gal glass tank? I'm going to build my own stand and would like to customize it so I'm looking for an optimum set-up. If any one has any ideas's and/or links it would be great. I reallly wanna DIY. 
