Need help with selection on fish for a 40B.

[iGaroux]

Hello new to this forum! Stupid question but can't really get a straight answer from my LFS so many here I can.

So I only have a 40 breeder ( 75Gallon cracked) was recently a reef tank. But interested getting back into freshwater but aggressive since the space is sorta small I was looking getting these fish (silver dollars,red hooks,black bars,red belly piranhas,black piranhas,arowanas or a Barracuda the yellow tail or others.

Would any of these fish stay Comfortable in a 40B? I mean not all of them but either a school of piranhas or silver's? Or would I only have them for little to no time?
If I can keep any would any of these fish be compatible? (Besides the piranhas)
In a bit of a jam only fish I like unless theres some suggestions.
Thanks!!

 

[Ryan1783]

Silver aro gets way too big, lots over people say 4 feet! But ones that I have kept max out p at around 30 inches or so.
Silver dollars yes
Red hooks yes
Barracuda no

 

[Ryan1783]

Fish that I would keep in a tank like that would be a nice aggressive cichlids like flower horn
Or even some unique looking fish like bichirs! Good luck finding a fish!

Oh yeah, WELCOME TO MFK

 

[iGaroux]

Would the piranhas be in the same park as silver's?
Yeah the Arowanas I'm familiar with I do have someone to give it to when it gets to big.