position : polyp, hammer, frogspawn

[Van-rookie]

Morning all....

I have some new addition in my tank and I need your advice on the best position to put them..

I know from the guy that I bought the hammer and frogspawn that they belong from the same family and can be put close together.

What I want to know is whether it is ok to put them near a green star polyp.

And also need info whether ricordia and mushroom are the same family..

sorry if my questions sound stupid

thanks