Which fish for 40 gallon tank?

[Aweshade9]

I have a cycled 40 gallon tank. It currently has 2 jds in there but around December I'm going to move them to a 55 gallon tank that I already have setup. When I move the jds I want to get either
1 Senegal Bichir (They say it will get +12 inches, but I think 8 inches is much more likely)
1 African Brown Knife Fish (The same size thing as the bichir)
1 Leopard Ctenopoma (6-7 inches)
or any combination of the three. Which fish or fishes do you think would be better.

 

[kavin2845]

if its a 40 gallon breeder then you can definitely keep the Senegal Bichir, not much knowledge on the others though