What is this

[Dfrashid]

When I bought this I was told it was an acan but when I got it home it doesn't open up like my other acan will some one help me i.d. this please the one on the live rock is the acan ive already had the other on the glass is the new one please help and thank you

 

[ChiCity]

it’s a lord

 

[Ben.QLD2]

Try a darker area.

 

[Dfrashid]

it’s a lord

What's the one behind it ? And thank you!

 

[encrustingacro]

Micromussa sp, not acan. True acans look like this: