Plerogyra vs physogyra touching

[starkii]

Can't find anything anywhere as to whether they can touch or need space between each other. Does anyone know?

 

[Dkuhlmann]

Try this

http://www.advancedaquarist.com/2010/4/corals

 

[Mark9]

Had to use the google.
Plerogyra = bubble coral
physogyra = pearl bubble coral
I have no idea, but why not try it?
Put them real close and see what happens.
if there is a problem, give them some space.