A GOOD lfs SHOULD know what they are selling...... Many do not / or get it wrong. - in which case it's up to YOUR research. Google them and do a little reading on their differences AND requirements....and if you EVER want to see a clown host in it, each of these species hosts specific species of clownfish - so research that too.... My ocellaris clown ONLY want to host in H. magnifica, while my maroon prefers E. quadricolor.