I had to improve my CL intake screens for a few reasons. The Darts pulling 3000+ gph through the 2" intake created some pretty good suction through the existing screen. I thought that might be dangerous. The existing screen was not fine enough to filter out small sand. Sand particles were getting through to the OM-4ways...wearing them and sometimes jamming them.
Here's my solution.
I got some 2" intake screens from AquaticEco.com. The first thing I did was shorten the stem so that they screen would sit closer to the bulkhead.
I also took a 2" close nipple, and turned it into an extremely close nipple!
The front part of the screen is held fast by 8 plastic clips. It's clearly pressure fit during construction. By cutting 6 of those, the end piece can be removed with a little flexing, but still holds good when installed.
Using scissors, I trimmed a block of foam to fit inside the screen.
Finally, to remove any chance that the foam can be sucked into the plumbing, I put a small square of eggcrate at the bottom.
Here's the end result.

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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank:
http://www.canreef.com/vbulletin/showthread.php?t=28436