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In aquaria, 12", 18" and 30", but to see any of them that large is unusual. They're all generally compatible but can be aggressive.

This is covered in much greater detail in the stickies.
 
Didn't I just answer this earlier for you? :D:D:D

Most of the info you're looking for is in the sticky threads. I'll take a stab at it though don't hold this as gospel - scomb 12", tat 16-18", armatus 30+". Tats and scombs can be cohabbed possibly, not much can be put with an adult armatus.
 
Check the captive care sticky. Pretty informative.
 
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