Minimum size for a small banggai cardinal?

For a fully grown one, maybe 25-30, they will move but it will be mostly at night unless they've got a buddy. They can get more than 3" across between fin tips, so I'd avoid keeping them really small for any duration when fully grown.
 
Thinking about some inhabitants for my water box 10 cube. It only has a snowflake clown and coral. Probably just going to get some sort of goby that fits the tank size.
This is an older pic.
 

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I’m really open to any suggestions
My citron, green and yellow clown gobies just arrived today and I can already tell this little yellow clown goby is going to quickly become my favorite fish in my little nano and so is the green.
 

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