Everything sounds great so far
That being said, unless your clownfish are super tiny I think a 9 gallon nano might be a bit small for 2 clowns. You might wanna do a yasha/goby pair or some other goby or blenny...they have a lot of personalitu
Another option (which I'm sure you're planning on
) is to move the clowns to one of your other tanks once they outgrow the nano.