Honestly it's just luck for me.
The pH is around 6-7, only have litmus paper type testers, tewp. stays around 24-25, um the fluval lighting went a while back so at the moment it is a Phillips daylight bulb in a desk lamp. just use Prime when I do a bucket water change and have only been feeding them algae tablets.
Had this same luck with my panda cories a few years back. Just started finding babies in my big community tank.
Do miss those little guys