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.
 

HOW MUCH DOES A FISH’S FEEDING REQUIREMENTS AFFECT YOUR STOCKING DECISIONS?

  • A lot! - I avoid fish that require frequent or specialized feeding

    Votes: 5 29.4%
  • Quite a bit, but an automatic feeder can change my answer

    Votes: 3 17.6%
  • It depends on whether my nutrient export can handle it

    Votes: 3 17.6%
  • It depends on how badly I want the fish

    Votes: 5 29.4%
  • Not much. I’m willing to adjust my routine

    Votes: 4 23.5%
  • Not at all. Feeding demands don’t limit my stocking choices

    Votes: 4 23.5%
  • I usually learn about the demanding feeding schedule after buying the fish!

    Votes: 1 5.9%
  • I haven’t really considered this before

    Votes: 0 0.0%
  • Something else (see my comments in the thread)

    Votes: 0 0.0%
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