I know they're from different regions but just curious about a 30" west African Lungfish and a 16" Dovii coexisting. I have a chance to get the Lungfish and the Dovii has been solo for the past few months in my 300 gallon tank.
The Dovii will probably kill the Lungfish. Also Lungfish that size could possibly kill the Dovii.
The Dovii has claimed the 300 gallon so don't risk it.