I totally feel you on this one. There is absolutely nothing worse than the realization that you have kept a beautiful, healthy fish successfully and then lost it because it jumped to its own stupid death.

We have egg crate over the top of our tank for just this reason and are absolutely religious about keeping it covered at all times because we have a few notorious jumpers that are our favorites as well (several wrasses, hawks, gobies). Even have a "window" in the egg crate that is cut out and have a larger piece of egg crate over it, so that we can slide that over to feed or work in the tank without removing the entire top.

EVEN WITH ALL THAT, there is the occasional really determined fish that somehow manages to find a crevice to squeeze through, thinking that it is heading for the holy land I am sure. Just this weekend we discovered that our diamond goby (one of Mike's all time favorite fish) had somehow jumped out the back of a completely covered aquarium, probably while we were moving things around doing tank chores. We have also had the displeasure of seeing a really thin fish (long nosed hawk, firefish, etc.) that can manage to leap perfectly vertically through the openings of the egg crate and land on the top to broil under the MH lights. Horrifying.

I've seen Reefcube's net top and it does look slick. Also the holes are a bit smaller than the egg crate. This would definitely be the way to go with a visible open top that is not covered by canopy.

Good luck to you and sorry about your fairy wrasse!