My Selenicereus grandiflorus seedlings are now 6 months old! A couple of them didn’t survive, but those who did are looking pretty good. Right now none of my plants are getting enough sunlight. Winter in Denmark is always dark and cloudy and plants all over the country are suffering from etiolation. These seedlings do look like they’re ever so slightly etiolated, but not too much.
I still keep the Selenicereus seedlings slightly moist, but sometimes let the soil dry out for a couple of days if I forget to water.