Overhere a short video of my black water tank with my red tail splifins (Xenotoca doadrioi and formerly known as Xenotoca eisini, San Marcos). One of my favorite splitfins to be honest.
Like more goodeid species, they won't chase nor eat their fry. Goodeids do belong to the real livebearers (viviparous) unlike ovoviviparous livebearers such as e.g. guppies, platies, mollies, swordtails, etc.