well, if one is sick they'll both get sick but then you can treat them both at the same time. The safest is to get 2 sep. QTs but I think most people would either not get them at the same time or QT them together. The goal is really to protect the main tank. A divider wouldn't do anything because they could share many diseases just from the water, no need for contact....
I think it could be easier to form a pair if both of them are introduced at the same time. That's why I am thing of QT a pair of O.clowns at the same time. But I am afraid that 10 gal is too samll for them. Of course, as Dan mentioned, disease and parasite could problem too. However, I don't want to setup two 10 gal QT at the same time.
Probably I should ask: How to introduce two O.clowns with best chance of paring up?
<a href=showthread.php?s=&postid=7547246#post7547246 target=_blank>Originally posted</a> by lbear Is it ok to QT a pair of Ocellaris clowns in a 10 gal tank at the same time? Do I need a tank divider or enev get 2 10 gal tanks?