Ah, yes, that lovely "external digestion" that is so beloved of lungfish. Chew, chew, chew...spit it out to see how it's doing...chew some more...take another look....not their most endearing trait.
Tank looks great, nice mix of shapes and activity levels. The Clown Loaches are terrific as a school of high-class dithers. What species of Geos are those? And you were thinking of adding another 6 G.sveni?
Personally, I get a little tired of the bottom-hugging behaviour of some Geo types. I wanted balzanis for years, was ecstatic when I finally got some, but quickly grew tired of that 2-dimensional lifestyle. They rarely moved more than a few inches into the water column, never ate any food that wasn't on or almost on the bottom. My dimerus are better, but not much.
If you are adding more fish, I think you should consider something that is a little more surface-oriented. And with the mix you have now, you can choose some small schooling species for the role, since nothing you have is particularly predatory. I've heard that some Fire Eels can be fish-eaters, but the big one I had ignored any other fish regardless of size. Maybe a school of danios or small tetras?
There is something extra special about a peaceful tank that contains big gentle giants like your AUL in combination with a school of small, active fish higher in the water. And nothing makes a big tank look even bigger quite as perfectly as a bunch of small fish in it. Try it!
