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Depends on the lighting, how much space it will have and what else you have in there.
I have kept a fairly large hammer coral (not the same I know but similiar enough in regards to the conditions it needs) in a 14g nano with less then ideal PC lighting. Its been in there for probably close to 6 months now and is loads bigger then when I got it.
I think however that it was responsible for killing off a finger leather though which was fairly close to it so I think the space between it and your other corals is going to be something to consider.
From what I have read you should be ok otherwise assuming you have halfway decent light and water flow.
Your perfectly fine keeping them in a nano...if it gets too large, you can do as you have said, but i would frag it, then sell it or you can move it to somewhere else in your tank![]()