I bought bird netting from home depot and staple gunned it to my canopy openings. Must have for any wrasses, its already saved me a few a them.

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BRS 1/4" Clear Netting with cheap RONA black window screen kits.

http://i739.photobucket.com/albums/x...6-16105525.jpg

I have lots of jumpers......6 wrasses and a helfrich's. I built screen covers for my tank with screen frame kits from Rona and 1/4" clear screen mesh from Bulk Reef Supply. I had my tank built without bracing and a trimless top so I asked the builder to add an inside drop down "trim" which looks like black silicone on the outside of the tank.
http://i611.photobucket.com/albums/t...nx/file-34.jpg
http://i611.photobucket.com/albums/t...nx/file-35.jpg
http://i611.photobucket.com/albums/t...nx/file-36.jpg

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Sorry, but the clear screen at BRS does not block any measurable amount of light.

I glued plastic strips on the back of my screens to cut holes in for pipes and cords, same plastic as the glass kits.

I know I'll prolly get flack for this but I have always had glass lids on my tanks.
I'm sure the lids block light to some degree but my tank is doing well and its never been an issue.

I've never had any top on any tanks and the only fish I lost was due to it going through the over flow then out of the sump. It really depends on what fish you keep I think.

I have a lot of jumping wrasses too and went the mesh screen route. Works great and have not lost a single jumper since installing it. I also borrwwed a PAR meter to test any loss of light and didn't measure any loss on the PAR meter. Also no salt creep on the screen either.

It's a easy DIY project that can save lives! Heck, if you buy the materials I will gladly spend the 30 minutes to build one for you!