5 young Pantodon buchholzi
This auction is for for 5 small (3-5cm) butterfly fish.
The closest you can get to an arowana in a 10-gallon tank, Pantodons are members of the bony-tongued fish, the same group that includes Arowanas and Mormyrids. Freshwater butterflyfish are West African fish that frequent calm, plant-filled water, snatching insects from the surface and above. They're quite peaceful but have enormous mouths so use caution with smaller fish.
These are fish I raised in my fishroom in Minnesota on a diet of mosquito larvae and baby brine shrimp. My breeding notes can be found here: https://bogott.net/unspecified/?page_id=2828 -- mine show some interest in flake food but you might want to prepare to feed them something live for a bit after their arrival: fruit flies, mosquito larvae, ants, etc. They will not chase food to the bottom of a tank so are unlikely to care about blackworms.