Largest fish for 40 breeder

[Southjerseycichlidz]

habe an empty 40 breeder just set up looking for ideas for one big/bigger sized fish have ample filtration and everything set up let me know some cool ideas

 

[Yogosans14]

Fancy goldfish

 

[Yuki Rihwa]

Serrasalmus Elongatus, this one has extremely slow growth rate and I myself never see one that bigger than 7 inches in home aquarium yet.

 

[jclyde13]

My first thought was piranha, as well. Or you could go with a salvini or a Jack Dempsey.

 

[duanes]

I wouldn't put anything that grows larger than 4" as an adult in a 40 breeder.

 

[Holdenon5]

I would get a ruby red spilo. They max at around 7 inches and have plenty of attitude.