yeah if he is full grown its going to be rough in that issue of adding new angels heres an ideal though if you say you got a quarantine tank i would put him in that and add some more angels of greater size than the juvies, may cost a bit more though and after they are settled in return him to the tank so that everyone will have a fresh start, just my opinion aye..
Yeah that might work but I wouldnt want to cram him into a 10 gallon. Ill just buy some larger angels from this point if I decide to add any more.