Not exactly answering your question BUT:
I had a group of threadfins who were very happy in my 60L tank that was run without plants as a storage tank for my fish until the new tank was setup. When I moved the threadfins over they eventually died off, except for a single female who remains alive and well today, pretending to be a copper harlequin (I have a shoal). I noticed that the threadfins appeared to pump their gills (indicating CO2 is a bit high) before my other fish, so they may be more sensitive to CO2. I also found they ceased to display to each other, It seemed to me that they disliked the high flow I had in that tank.
A rather long answer but to summarise:
I struggled to keep threadfins happy in a high tech/high CO2/ high flow tank although I know threadfins have been used succesfully in the scape Brighid Sleeps, although I cannot remember the name of the scaper.