They were already there since last year I believe.
Specifically fluvitrygon signifer ! They were previously at the circular tank that house the potamotrygon ray, in front of the former touch pool.
Like I said, the gourami room has been mentioned during the revitalization as being planned to house aquatic amphibians, like axolotl. Though there haven't been any update of it.
The archerfish are definitely going to be added soon or atleast are present off-display, they're still signed in the Jagat Satwa Nusantara website. I forgot the exact number, but I think they labelled multiple species of archerfish.
Hopefully they'll get those unfinished parts done, since the insect museum's revitalization should be finished by now