it looks as though O. woworae is definitely limited to Muna
Yes, although it's not limited to a single stream at least, so you should have some more leeway. The tank looks really nice, a bit too nice for a biotope maybe. These are a couple of my photos from a small stream in Borneo, which should be fairly similar:
As you can see, great conditions for plants; shallow clear water and plenty of sun. The problem is that the monsoon passes this area twice a year, so water levels, flow and sediments will fluctuate a lot preventing plant growth. If you're not dead set on
O. woworae (which is the best looking I have to admit), maybe consider
O. latipes or
pectoralis instead, and that should give you more freedom. Some aquarium examples:
Guangdong swamp,
Yangmei river, and
Taiwan stream, pretty close to what you have already.
Of course it all depends depends on how strict you are about the definition of a biotope (I sit pretty close to the fanatical side, so I would consider importing leeches for a Borneo rainforest biotope for example
), and I'm sure you can make some
O. woworae very happy in there as it is.