I'm sorry; But that Tank is way to Small for a Fish of that Size!!! I have several LungFish and all of them are in tanks that our 110g. for an 8inch to a 400g. This is not cool and we as Monster Keepers should know that the Health and Well Being of our Pets comes First over our Ego on What is "Cool" to Have!!
Sad.....benefit said:A 110g for a 8" Protopterus. There certainly isnt anything WRONG with that but it definantly is not needed at all. Im glad you put little fish in huge tanks but dont put people down because you choose to go overboard (which like i said there is nothing wrong with but it isnt needed). Personally i would keep the fish in a 125-180g but to each there own. Fish looks healthy to me.