Possibly two separate individuals.
They look quite clowny and garish up close, but from a distance, their coloration is amazingly effective at camouflaging them.
This one had vertical banding continuous from dorsal to ventral surface
iNat Computer Vision suggests Rainbow Darter. However, there are no prior iNat reported observations of that species in Hot Springs National Park or near Hot Spinhgs or the southwestern quarter of the state. There being more than 200 species of darter located in Arkansas, I can't classify this interesting fish further.
Key features are the striking red coloration on the tail and fins and the barred patterning of its body. I got only this one twilight picture and did not see these fish in the morning when I returned to the site.
@neomyte