Well the first batch of eggs failed. Not sure if they made it to the "wriggler" stage. I went away for a weekend and they were gone by the time I got back.
However, they've recently tried again - with much more success!
The fry are now a week old (since hatching).
The parents laid the eggs on the large piece of bogwood. While the eggs were maturing, the parents ferociously dug a large hole / nest in the hairgrass X_X down to the dirt. When the eggs were just on the verge of hatching, the parent fish took turns carrying them down into the nest. I observed the wrigglers in the nest for 2 days, then left for a 4 day trip to my girlfriend's place. During this 4 day period the tank received no feeding other than the algae tab I dropped in before taking off. Much to my surprise, I came back to free swimming fry.
Any tips would be greatly appreciated - I don't have a solid plan of what to do if any of them make it to adult hood.
Also, I've chopped down the tall piece of wood - which was quite an upsetting experience for the tank. It is unfortunate, but I did not have an appropriate lighting solution for that setup.
Below, you can see the top of the log replanted with ludwigia sp. red clippings from the tank.