how big do clow triggers get ?

[aussie260]

I know that out in the wild clown triggers can reach 20 inches but how big do they usualy get in a home aquarium ?
and how long would their tank need to be ?

 

[n8ball2013]

it doesnt matter how big its how mean. It will eventually go psychopathic and start killing fish its lived with for years. Ive seen clown triggers in the 12-16 inch range.