What's a Borneo Suckerfish, *please*, surely?
Anyway, manners aside, it's almost certainly a member of the "hillstream loach" family, the Balitoridae. As their name suggests, these fish inhabit fast-flowing streams that are relatively cool, rich in oxygen, and generally low in hardness and nitrates. they feed primarily on green algae (not diatoms or hair algae) and especially on
aufwuchs, the small invertebrates (such as rotifers and tiny crustaceans) found in the algae.
Because they need low nitrates, high oxygen, and subtropical water (~ 18 to 22 degrees C) they are singularly ill-adapted to life in the standard community aquarium. Lots of people buy them for tropical tanks, and then are surprised that they die after a few weeks.
On the other hand, you could mix them with white cloud mountain minnows and white-cheeked gobies (
Rhinogobius duospilus) in a clean tank with a powerful filter. All these fish require the same conditions, and should do well together.
By the way,
Gastromyzon borneensis is a common species and quite likely the species being sold as the Borneo suckerfish, but there are lots of species and telling them apart isn't easy.
Cheers,
Neale
PS. There's quite a good article
here.