Reef safeness with most dwarfs is hit and miss but most do OK, it will of course be subject to the individual so just have a plan for removal if it happens and exceeds your acceptable limits. If you just moved the Beauty within the last week then the sooner you can add the other dwarf the better. Coral Beauties can be mean and some will settle quicker than others. Again, be prepared to remove one if things don't go well. If you have a QT tank available I'd take the CB out till you get your hand on the a Flame and then put them both in together.