I wouldn't think Krobia, if I remember right, their horizontal band ends at the insertion of the soft dorsal fin and not at the caudal fin like the first pic shows.
Yes, a washed out tetramerus seems reasonable, there are a number of Aequidens with the dark spot, sandwiched between 2 white/light vertical bands (pallidus, supermaculatus, even michaelli to some extent). Hard to tell its normal coloration is so washed out by the light substrate.