Ich and what carries it?!

[mark]

Though possible you would bring ich across, sounds like you will be having two tanks anyway which would allow you to break the life cycle.

Set up 210 with your rock and coral, all fish in in the 50 for your 6-8 week treatment and observation.

Big caution with a QT is make sure to monitor for NH3 frequently as since no rock or for biological filtering it can build quickly.