Do I split this custard apple tree?

[Martinbrick]

I am wondering do I split it and post them individually and if so should I do that immediately

[Epicatt2]

I am wondering do I split it and post them individually and if so should I do that immediately

If you can do so very carefully and gently so as to not damage their root system(s) that would
be what I'd do with these.  And it'd likely be best to do this before they grow too much larger. 

Just FWIW . . .

Paul M.
==

[Rob From Sydney]

Be careful - the two seedlings could share the same root system. Do a bit of digging and have a look.
If this is the case, remove the less vigorous shoot.
Otherwise, if they both have their own root systems, you can separate them.