Birger's response would be my guess on them. although having never seen the other species alive, i couldn't be definite
Do you have any for sale?
For spawning, I would make sure they have debris/leaf litter to hide among and just let them go. When my old microglanis would spawn, I would get like 5-10 fry without doing anything.
something I noticed that helped trigger was feeding ants
![Smile :)](./images/smilies/icon/smile.gif)
our neighbor had some carpenter ants and I would collect 15-20 a day and throw them in there.