Q.What Is This Cactus And What Are Its Growing Habits
(I posted this before but the pix didn’t take.) It is a cutting I was given. Tendrils are coming out of the top of the “leaf.” Now some small tendrils are popping out of the older ones. The parent plant was in very poor condition, but basically, all “leaves” had tendrils coming out, which were all soft, with air roots. The indentations on the ‘leaf’ are more pronounced than the ones on my oxypetalum. (The round leaf with babies at the bottom of the picture is a completely different plant..not part of this question!) I would love to know what this plant is called, but more important is to know its growing habit…does it climb, and need support, or does it sprawl and belong in a hanging basket, or something completely different? I really want it to thrive!

Certified GKH Gardening Expert
That is a Dragon fruit or a Night Blooming Cereus. Hard to say which, but I am leaning towards and NBC. It is just lacking light, very seriously. When this happens the plant will stretch in search of full sun.
If you are not able to provide full sun, then you will need a light of at least 100 watts to keep it happy.
Here are some articles that will help:
https://www.gardeningknowhow.com/ornamental/cacti-succulents/night-blooming-cereus