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.
 

WHICH FLOW PROBLEM IS HARDEST TO SOLVE IN YOUR REEF?

  • Eliminating dead spots

    Votes: 9 20.9%
  • Keeping sand from blowing around

    Votes: 5 11.6%
  • Balancing flow for different coral types

    Votes: 11 25.6%
  • Creating random or turbulent movement

    Votes: 2 4.7%
  • Finding effective pump placement

    Votes: 2 4.7%
  • Managing noise or vibration

    Votes: 2 4.7%
  • Keeping pumps hidden and accessible

    Votes: 3 7.0%
  • I still feel like I’m mostly guessing

    Votes: 9 20.9%
  • Other (Comment in the thread)

    Votes: 0 0.0%
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