angel fish and FW dip

[howdy20012002]

I have a Eibli Angel (beautiful fish) and am getting a flame angel tomorrow.
I want to put them into the same tank. ( a corner 55 gallon)
Currently the Eibli is in my invert tank(quarantine)..and I will be putting the flame angel into another one of my invert tanks.
Just to make sure that it is disease free.
My questions are these:
How do you do the FW dip?
and is it safe to put them into the same tank? some reading that i have done suggests that you shouldn't have 2 angels in the same tank. However, I will be putting them into the tank at the same time, so I am hoping that will not allow them to be overly aggressive towards each other over territory.
Any suggestions?
thanks
Neal