My arowana I got at 5". It hit 18" in 10 months. I fed the thing heavy though, you could expect your 150 gallon to last around 1.5-2 years
I'd say less, 1 year. I got my Aro around 6-7" and in just 10 months it looked big in my 250g it was easy 24-25"
I'
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That's some crazy growth, were you heavy feeding it?
Yeah I agree a Florida would be good and they grow really slow I've had one for over two years now I got him when he was 4-5" now he's 14" and I feed him good