Treat the Selenotoca papuensis as any other scat. The info I have on the papuensis is somewhat lacking, but I’ll give you what I have.
These scats are from the Western Pacific around Sulawesi and Papua New Guinea. They grow 3.5” - 4”. They are commonly confused with Selentoca multifasciata, which can reach 6” - 8”.
Scats in general tend to be easy in care, but if you want to watch for their weak spot, it would be their eyes. Lack of aquarium maintenance can lead to problems like HITH and lymphocystis.
Scats tend to live a catadromous life. As young, they tend to live in lighter salinities and then progress to more dense waters as adults. As an adult, scats prefer their water to measure SG 1.012 to 1.025.
As far as their diet, you should have no problems getting them to take anything, but scats need plant matter in their diet. Scats are somewhat piggish. They are messy and will eat anything. Plants in the aquarium typically don’t stand a chance, nor do bite size tank mates. Don’t use java ferns in the aquarium, as some report it as toxic to theses fish. Filter the aquarium well. They are peaceful schoolers, though they can be somewhat independent from the school and they are omnivorous. I stress this in that they are opportunist eaters; small fish are food.
Hope this helps!
