Don't think it would be a tucano that late or low.
To low fly at night you would have to be on NVG - again something the tucano doesn't do.
Probably would have been a C-130 if it was definitely a Prop at the hight you say - would have been 250' MSD (rad alt is set to 225' to stop it constantly going off at 250')
I don't thing we have any other prop low level NVG aircraft