“Swim Instructor Nightmare” (** out of four) was a pedestrian suspense thriller about a psychotic swim instructor (Sydney Hamm) who is hired by a family (CJ Hammond and Shellie Sterling) to teach their young daughter (Kiarra Beasley) how to swim but realize too-little/too-late that she is a sociopath/psychopath intent on taking over the household. Overall efficient filmmaking and a strong lead performance from Hamm can’t keep film from drowning in its own predictability and plot cliches. Final showdown is especially weak. Watch “Swimfan” instead.