bigboss: I have to apologise on behalf of males.... i am one of those predator lovers!! i have three aros
Silver is actually very flexible, you can realistically get away with having one under 2 foot in a to 6 foot tank
but, you will need to upgrade and it is cruel. they get so long itscrazy! and so quick too.
perhaps wonder world was trying to make a sale... i did expect better from them - but then again, hobbyists know more about monsters than pet stores, they sell it cos it has a good price margin at times.
and by the way

there is always enough room for big tanks, it just means something has to give

lol
but really, asilver o any aros a commitment. Im from NZ too, so i know how expensive they are here. dont buy one and try to flog it off, its never easy seling a big fish like silver aro.
ask him to contact us and read this stuff, he will realise that the pet shop guy is wrong.
or better, GOOGLE it, it will tell you that these fish get 1metre or so

lol then he will get a fright. though 1 metre in captivity is rare i think - but more than 2 foot isnt.
YOu might think thtas small, but its darn huge!!!