ya there very mean, i got lucky mine dost even touch goldfish, but they have even been know to try and get ur hand when cleaing te tank, prob one of the most mean catys out there for surejust google them dude. if you get those two wrong, then you deserve to be ripped off.
but incase you didn't know already, you CAN'T keep anything (especially another catfish) with an asian red tail.
it might work for the first few months, but once they get 12", you should expect dead tankmates.