I've actually found that wrasses are fine without cover if it the aquarium is at least 20" deep.
I do have a very nice custom cut glass cover coming in a week or two. I've had several holes cut uniformly to aid in light penetration and condensation. It cost a lot but it'll be worth it in reducing the refill on my ATO RODI.
Nice, please take pictures and if you recommend it after X weeks. Please let us know. I will likely need one but didn't want the same issues rising up with light penetration and condensation.
Sorry for the lack of updates so here's a monster one.
I have a potter and flamehawk in there who enjoy each other.
Ended up selling the butterfly because he was getting a little big for the tank. Might also be selling the yellow tang there just to get my bioload down.