I worked at a small petstore here in oregon and we housed a jardini with a large african lungfish and he bit the lungfishes legs off! It was a shame but we separated them out and the lungfishes legs grew back. Jardini's are pretty beastly but they have a lot of personality.
I'll have to get some updated pics. My Jar is 19-20" and has 3 barbels.
He knocked one off, and when it grew back it was split into 2 on the right side.