Are Micromussa the same as Acans?

Not the same but they behave exactly alike. You can actually place them next to each other without any warfare. Most micros are smaller then lords, but I have some that are larger then the lords when they are both fully open. The skeletons of micros are always smaller then lords.
 
I have seen some local LFS calling what appeared to be acans as large micros. Is there any way to specifically tell? I have been told that some micros can be fairly large polyped.
 
aside from being smaller then acans there isnt much difference. as a matter of fact for a long time they were considered lords. to the trained eye you can see a slight difference between the two. there is nothing distinct (beyond the size difference) but they do have a slightly different appearance. as with most corals the best way to be able to id a coral is to check out the skeleton or examine tons of pics and get a good feel for what your looking at.
 
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