Thanks for everyone's suggestions and information.
natep: Yes, I had A. Percula and A. Sandkrinos separately as well as a maroon. Perc and maroon were very young when I got them. I had them together for a couple of months, then separated.
surgeon and daveocean: Thanks for your input. I just wanted to avoid having 3 separate pairs of clowns that I need to find separate tanks for......so if I can just have them get along, then that's one less tank for me to keep!

Since the start of the thread, I tried putting the maroon and perc back together in a 37 gallon tank with 3 bubble tips. So far no shredded fins so we shall see. If the perc is not accepted, I will try with the skunk.
Thanks daveocean for your compliment regarding my stand, actually the trim was not done the way I wanted it, but the rest looks nice. I'm nervous about keeping the wood nice, but I do love the wood! I want to put another protective coat, any suggestions?
MarinaP: Your link is one of my bookmarks as well as the one velvetelvis suggested. I was going to order from them when the weather gets better. I also saw some eel grass on ebay, but I have to look up the seller's name.
I would love to do turtle grass or eel grass, but not sure if it will survive. I did have it before in a mixed reef and it did well.
Velvetelvis: Thank you so much for your nice words. I plan to add some vertical pieces (columns) after the giganteas settle down. I figured out with the original cube that your aquascape and plans are out the window after they get in there and settle where they want. You end up moving rocks around afterwards not to make it look nice, but to accommodate their space. I have a pair of onyx right now surfing the 4 (5?) giganteas. I'm hoping they all survive the upgrade.
I would love to see your tank too!