Until you have a bunch of experience...always (99%) start a coral at the bottom of the tank and see how it does, and then move it up a few inches per week.
Many corals can be severly damaged if placed up too high in the tank when first introduced, so it's best to do at least one of the following:
-find out from the prior owner what conditions (light & flow) the coral was living under..and if it was thriving in that situation.
-ask what type of coral it is. Once identified, google it so you can find out how to care for it & learn about it.
Zoas don't need to be fed.
Medium flow is fine for them.
Some pink zoas like it high in the tank and I've found that others don't.
With zoas you
always want to start them on the bottom of the tank. If they stretch (literally) toward your lights, move them up a few inches for a few days to a week and see how they react, if still stretching, move them a little higher up.
If they look happy..open fully, skirts (the outer frilly edges) wide open (not curled up) you can leave them where they are or move them up a little and see if they are still doing well..and so on.
What is the other coral and can you take pics?