Pooping is an excellent sign. 78F is not too bad, but some current and high O2 are essential if you want him to live for a long time.
G.ctenocephalus and G.scitulus are very similar and it makes not difference for care; both have a pattern of dots. G.ctenocephalus appears to be much more common. If you want to find out what you got, make the photos of the dorsal (top) and caudal (tail) fins when they are fully open.---this, btw, is usually easier to do when the animal sits on a stone.
G.ctenocephalus and G.scitulus are very similar and it makes not difference for care; both have a pattern of dots. G.ctenocephalus appears to be much more common. If you want to find out what you got, make the photos of the dorsal (top) and caudal (tail) fins when they are fully open.---this, btw, is usually easier to do when the animal sits on a stone.