Not my stuff Bruce. I have a line to a WD, but it's not a must have at the moment.
Depends on how long you want to view your tank. If you've ever seen an all blue tank in person, you won't be able to take a look at it for long. JF tank is a good example of that. My buddy and his wife visited his place to check out his setup and they couldn't look at the tank for too long. Their eyes were hurting after awhile.
Another reason to not do so is because it works with corals that fluorescence but not for those without. You can see samples of each of them under the royal blues only wide angle shot above. The ones that don't stand out are the ones that shows the best with a full spectrum.