Time for an update
This paludarium has been running just fine. How do I know that? Well the photo above is telling a story on its own ;-) One of the female Pseudosesarma moeshi has eggs again! I have seen 1 male and another female present, but the 4th crab is still somewhere hiding. I wouldn't say it is dead. It is easy to discover a dead crab... follow your nose, it does smell nasty. I am sure it is still alive. Sometimes it is very hard to see the crabs, they prefer being safe behind the rocks.
My Golden Apple Snails are doing fine. 2 of them are very active, while the 3rd one seem to be closed most of the time. I checked and it is alive.
Plants are almost destroyed by the Crabs (eaten). The only untouched plant is the Anubias afzelii for some reason. I perform weekly 50% water change. I feed the Crabs every day exclusively with the Crab Sticks from Hikari.