I love the tank and I can't wait till you are able to post updated pictures. The lighting sounds like there was alot of thought and effort for realism!
It is interesting seeing a snakehead swim, I own a bowfin and it swims using its dorsal fin(the raised fin along its back and belly) more for locomotion, where your snakehead swims more with its front fins, more like my bichirs. My bowfin looks way mean, but it is actually very docile in my tank.
Thank you for sharing!