Maroons and Tomatos can be rough on each other, but Ocellaris and Percula are the calmest fish.
Bucket overnight? That's crazy talk.
Too much trouble.
If there are any doubts that they will get along, just do what we suggest doing for all new fish - overfeed before and after and use an acclimation container. Acclimation can be as simple as a clear plastic quart deli container that has netting/bridal veil/toule over the top, held on with an elastic. That's what I use. Leave the new fish in the container until it looks like the other fish are ignoring it, a day is typically all it takes. Also familiarize yourself with the fish training method. Feed with garlic oil per the instructions. Here is the Reefkeeping Tip where we went into more detail about adding new fish:
http://utahreefs.com/forum/forum_posts.asp?TID=34014 Aloha,
Mark