What a wonderful thread. Congratulations, all three renditions have been excellent. Also, you pick the most interesting fish species. What made you decide on the Parosphromenus sp. 'sentang', and then the Sawbwa resplendens?
Also, you mentioned a PhD supervisor so I take it you are in school. I would be interested to know what you are studying, if it isn't too intrusive to ask. I think your low tech approach should be inspiring to all. Examples such as this show that perhaps some of us try too hard with our aquariums. That is perhaps we try to do too much, and should let them take their own course.