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.
 
Love my yellow watchman goby, can't wait for his pistol shrimp to arrive! BFFs for life. Fingers crossed.

Everyone post your favorite duo for name ideas. Ex: Batman and Robin, Starsky and Hutch, Lindon and Holder.
 

WHAT PART OF LIVING WITH A REEF TOOK YOU BY SURPRISE?

  • How much space the supplies and equipment take up

    Votes: 10 45.5%
  • Salt creep, spills, and cleanup outside the tank

    Votes: 2 9.1%
  • Planning trips or finding someone to care for the reef

    Votes: 7 31.8%
  • How attached I’d get to individual animals

    Votes: 2 9.1%
  • Making decisions when there’s no clear right answer

    Votes: 4 18.2%
  • How much the reef affects everyday household life

    Votes: 6 27.3%
  • Nothing in particular, I felt well prepared

    Votes: 1 4.5%
  • Other (Post in the comments)

    Votes: 1 4.5%
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