Arowana scales can get curled ?

[monsterfishdude]

I've been reading online it says in sudden change of tempature it can get fatal it's skin (scales) can curl up is that true ?
http://malaysiangolddragon.blogspot.ca/2011/05/how-to-set-up-brand-new-arowana-fish.html?m=1
I found that in that link


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