Clownfish and overflow

Be careful about small clownfish getting through overflows. One of my new little snowflakes went down the overflow and into the skimmer pump. I'm so sad. Now outfitting something to make the overflow teeth smaller.

The clowns I have are all from the same batch (siblings). Do you think I can get another small clown or a couple of them, of the same size and put it with the group of 7 I have now? Or will they likely not accept it?
 
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