I Want A Cool Fish.

as long as they are bigger than their mouth, other wise they will be a snack. very social too, he's always coming up to my hands when I'm in the tank.
 
what kinds of fish can i put in with it if any at all?
 
How about this? If you want something predatory and agressive. Try the pike livebearer aka Belenesox belizanus. These are the monsters of the Live Bearer world. The female gets up to 9 inches and the male 7. They are pretty mean and prefer live foods. Just look at the teeth in the close up.
belonesox_belizanus4.jpg

belonesox_belizanus1.jpg

belonesox_belizanus_pike_livebearer289.jpg
 
The Senegal Bichir (Dino Eel) can be kept w/ pretty much anything that won't fit in its mouth and won't disturb it.

Good Tankmates: African Butterfly Fish
Knifes
 
but will a dino eel and a african butterfly fish fit in my 55
 
Yes, they will. In fact, you could probably get several of each. Here is a setup Spartan reccomended to me:

2 Dinosaur Eels (polypterus senegalus)
1 african knife (Xenomistus nigri)
2 or 3 African butterfly fish
 
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