Star fish

[Dearth]

I am looking at maybe getting a star fish this spring but not sure what the best type to get for my tank a 33 gallon. I have heard even reef safe starfish might decide to eat fish at that reside on the bottom and some that are not considered reef safe end up being reef safe so I'm a little confused.

What are the best choices for a nano reef?

What are your opinions on star fish are they worth it or endless cause for worry?

How sensitive are they to salinity/temperature changes?

Any info is much lay appreciated thank you