will he be ok

[USMCtanker]

I have a 14" Protopterus dolloi. i have a tank for him but i would like to put him in my bigger one. will he eat the other fish. they range from 5" to 10". oh and what is a good thing to feed this guy and how fast will he grow. Is this a rare lung fish or a more common. I also have 6" Protopterus aethiopicus congicus. anyone ever had this one. could i put him with the big one, prob not. but i have seen pics of peoples lungfish with other smaller fish and smaller lung fish but not the kind i have

[Copeina]

IME, if it fits in their mouth, it's food. Also, they kick the hell out of one another.

I wouldn't combine even the 6" specimen with anything less than a 10"+ tankmate.

I don't know what differentiates the 2 species, but I have cared for them in my employ at our LFS and found the above to be true.

Good luck,
/Kris

[Oddball]

I've never been able to mix any african lungfish species with other fish. Even fish too large for a LF to eat can have chunks easily taken out of it. Most recently, I had a foot-long mbu puffer eaten by a 20" aethiopicus that's 1/2 the girth of the puffer.
The only lungfish species I've had luck mixing in a community set up are the australian lungfish (Neoceratodus fosteri) and the south american lungfish (Lepidosiren paradoxa)

[SimonL]

My 24"annectens is very peaceful, all of its tankmates are smaller and except for shiny, silver fish like silver dollars and my unfortunate 12" payara (all I found was the head) he leaves them alone. However I once tried adding an equal sized dolloi, and man, what a battle. It was like watching bull elephant seals fight....