can these live with cichlids?
 

can these 2 fish live with cichlids and jack dempsey i have to convicts currently so if i would add them it would be soon so the fish wouldnt get eaten

Black Ghost Knife, Dinosaur Bichir

I think the bichir would be fine, although I'm not sure about the ghost knife. It really depends how big it is because mine got eaten by the bichir. :(

Birchir is fine but you will still need to keep an eye for aggression from the JD.

If the JD shows any sign of aggression separate them IMMEDIATELY, otherwise it will bye bye Birchir if the JD goes after it.

I would certainly NOT add the BGK into the tank with them, it will likely be stressed to death real quick with a JD.

Adding to this the "Dinosaur Bichir" is actually properly called Polypterus senegalus. Also knows as the Senegal Bichir. These fish don't bother anything that isn't small enough to put in their mouths. So long as you give it a good hide spot and your other fish are bigger than it's head it won't cause any real issue. One question though, how big of a tank is this that you want to put these fish into?

a 55 gallon tank

Is it a "long" tank or a "tall" one? What is the length? What is the depth? What is your height? What is your water level kept at?

L x W x H = 48 1/4 x 12 3/4 x 21 i keep it full to the top
a long tank

Yea that should be fine than.

Keep this in mind: Can get up to 1 foot, but if placed in an aquarium of over 6 feet, they can grow over a foot.

Read more: http://www.tropicalfishkeeping.com/p...#ixzz1sEh8c129

That means if you can...get a bigger tank. Although the 4 foot tank will be suitable for it :) Good luck!

I would go with a single Bichir. However that water level has to be dropped by at least 2 inches. Bichirs are lung fish. They need to be able to swim to the top of the tank, gulp down air and get back down. Also if your water level is too high they can work their way out of any opening including the opening where your filter goes in.