I would definitely go with 2.
Clowns, IMO, are much happier with a partner.
I had one by itself for a long time and it just seemed to mope in the corner.
Just recently I added another one to the tank and the both clowns seem to be out and about more, not nearly as anti-social.
I think you should be fine with 2 in a 10 gallon as long as that is it.
Now you just need something for them to host in.
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Way too much time and money has gone into this hobby....and yet, I CAN'T STOP
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