I'd please possibly a large chalice?

This was sold to me as a chalice but the lfs wasn't to sure can anyone verify?

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It's purple. The thing is huge and I couldn't pass up the price usually I won't buy if I don't know exactly what it is but I made an exception for this one.
 
The lepto seem to have a maze like pattern to most I was thinking maybe a echinopora but it's hard to tell and i dont know very much aboit chalices. I'll post a zoomed in shot later on
 
It does look like some kind of chalice, or maybe an echinopora species, or some other, I think there's like 8 genra in the family pectiniidae its most likely a species from one of them.
 
That's what I was thinking it's just hard to tell since I posted this I found a pic of enchinopora lamellosa that looked similar.
I paid 85 for it and it's like 10 ×8 if not not more so whatever it is I got it for a good deal and it had some recession that has already colored back up so I'm happy with it. Would you have a suggestions on healthy keeping? I know the basics but what about feeding?
 
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