Looks Good.
This will need to be a dirty mature scape with lots of food for the Indostomus to hunt and prey upon. Would be good to have a an established colony of shrimp for the toothpicks to predate on. They will hunt for shrimplets and will snatch from the females berried load.
If you have access to daphnia, would also be good to setup a colony in a bucket in the garden.
Microworms/Grindle worms also another good shout for feeding them with.
Vinegar eels are also a very very easy food source, i used to add an apple core to the tub of worms every few months to keep it going.
During the summer, you can collect the tiny brown rafts of mosquito eggs from tubs of still water, and they will hatch for the toothpicks to hunt aswell. I used to do this for mine and as a treat for the imbellis' to hunt.
Ive kept both Crocodilus and Paradoxus, and they are a joy to watch flitting about looking for food. jus hard to feed.
Good choice for other fish, either would be a great dither for these fish. Or maybe have a look at the Imbellis betta, great peaceful communal betta, which can be kept in mixed groups.
If you can find some 35mm film canisters Badis and liqourice will spawn in them.
They dont like flow, so a sponge filter would be good, and this would also double as a good grazing area for the shrimp and hunting ground for the toothpicks.