You will need a very big tank for either one.  They also have to be kept away from other fish.

I had both barra and a jack in my fishtank. I set it up as a normal freshwater then changed it to full saltwater. i I got rid of the barra as they were growing too quick, You need a very big tank for either of these species. The barra you can get almost every fish shop or the fremantle tafe. The jacks are pretty rare to find and if you do find one expect to pay a couple hundred for one.

If your not very experienced in keeping fish then i would go down south and catch some redfin. They are aggressive like jacks and are really hardy...

a Jack in a tank would be pretty cool to look at, can't say I've seen one in a tank before.

ive kept fish for ages just looking for something different,

will tank size stunt growth like other fish or will they just keep growing,

what size tank do you think is decent, i have a 4ft tank at the moment

Vebas down in O'connor used to have Jacks in stock all the time when i had a tank.And the fish market in Myaree was a lot cheaper to get barra.

I got a little barra from Poincianna nursery in Karratha LIA.  Only $15 and he is now a fat little "tennis ball with fins"

They had been raised on fish pellets, so very easy to feed, but he much prefers live prawns, fish pieces or catch a few moths at night time around your outdoor lights.

The jacks usually live in fresh/brackish water when they are smaller and once they reach around 30cm or so they usually head out to full salt hence why they catch them in offshore reefs. They grow to 9kg and have a long life span so be prepared to have them for a while. They keep growing regardless of tank size as with all marine fish. They also very aggressive and will kill anything in the tank regardless of size.

to tell you the truth, I think you're going to struggle to find one in perth. Might be able to order them in from QLD but is quite a hassle. If i were you i would grab a few redfin for the 4ft, they dont grow as big, easy to look after (wont even need a heater), hardy and of course the cost nothing to get. 

I had a 600l 5ft for my jack but even that was too small, minimum size would be 6x2x2 900L IMO. 

If you need any other info feel free to pm me.

We have a pet jack at work and he's got character, much more so than the barra (mind you, we don't have them individualised)  I'd go the jack for sure, mind you, the barra feeding is pretty damn cool as well.  Will try and get a vid for you.

im not 100% but im pretty certain they sell live barra at golden ponds. Try give em a bell.

i bought a jack from aquotix in canningvale about a year ago for $65, was an awesome fish. they do need big tanks, I had a 4 footer and the guy at the shop told me it would be good enough for a while but would need bigger eventually.

4ft wouldn't last you very long for either fish mate - they'll stunt temporarily but will eventually die

it's a sad thing to see an overgrown fish in an undersized tank anyway

yep looks like im going to have to get myself a new tank, cheers for the help guys

barra at the K-Town nursury aye, might have to pay a visit, i have an outdoor pond and the previous owner had a barra in it, could be cool.