P. pahuensis, similar to filamentosus, is known for some unusual nesting sites, but normally they don’t avoid caves. I had a spawning below an algae magnet near the surface.
We should be happy about our many pahuensis. Only some years ago this species was totally missing in our aquarium stocks all over the world, except Japan. Team Borneo caught some, and very few of them were brought from Japan to Europe. Horst Linke gave me a pair: I hardly couldn’t believe it. They were propagated mainly in Germany, and now we have quite a good stock. Let’s handle them with care. Some misfortune, and they could be Lost again!