moving with lungfish already bro? I think there are some people here who kept the two species together. They're more expensive than bichirs here but cheaper than plats
That would depend on how you stock your tank. Less fish then the lungfish will just get rid of all the bichirs. More fish then there is a chance it may work.
I wouldnt put a lungfish with any other tankmates. They have very bad eyesight and will eat anything that getts too close. They can get huge and most tankmates will become a snack. Some ppl try it with success but its a gamble with fish lives and the cost of replacing costly fish like poly's.