as far as I know, as long as you did a full 2 week cycle to make sure all the ich was gone.
But it is still a good idea to quarantine any new fish in a small established tank for 2 weeks prior to adding them to any established tanks. If you don't have a quarantine tank i would recommend buying one, even a small one (my quarantine is only 2.5 for the time being) they will save you ALOT of money and hassle down the road. 1 sick fish can really wreck havoc on a tank