borneo is same as kalimantan. Borneo is well known word for kalimantan amongs westeners and malaysian while indonesian native call the island as kalimantan
Never heard that malaysia river produce clown loach. I had discussion with malaysian that informed me he bought biz size clown loach with price triple than price in indonesia. This indicate that they have no clown loach on their river system. In addition, clown loach is singapore comes from Jakarta as point of export. If malaysia has clown loach, it will be more economical for spore to import the fish from malaysia, given the benefit in shipping cost
Some region that well known as clown loach source in kalimantan is palangkaraya and pontianak while in sumatra is jambi and palembang
I believe that kalimantan river system bring benefit to good colour of its native fishes. Not only clown loach, but also arowana and wild betta. Wild betta in kalimantan is more attractive in color compared to sumatera. Same thing for aro. super red arowana origin is Kalimantan while sumatra is well known for its RTG and mahato golden.
Yes definetely sure that Neil's loach comes from kalimantan. I will try to take pic of sumatera's clown loach as good as I can (I am not a pro photografer, bad skill in photography

)
Never directly agree with which written on paper.
Some paper said that maximum size for hemigabrus wyckii (cristal eye catfish) is only 90 cm in wild. I personally have seen speciment that reach over 1 m in standard length.
We have biodiversity more than what amazon system have, but we lack of research. We have tor tombroides is sumatera and kalimantan but no one ever study nor breed them while malaysian has good research on them as mahseer has high price for its delicious taste.