I don't think there's such a thing as 'dwarf' dragon fruit. Even if there was, planting from seed probably wouldn't recreate the same plant as the original.

It's just morons on eBay trying to getaway with little to no knowledge. It's regular size don't sweat it.

Yeah, never heard of a dwarf dragon fruit plant. However, some varieties put out smaller fruit while some have much larger ones. The seller lists the seeds as yellow/red/white and his pictures show both red and yellow fruit. He doesn't have a clue what he's selling..... avoid!

I have some thin stemmed Selenicereus...resembles S. hondurensis. I need to plant them out. But small cuttings took our wet cold winter in pots. Look nice right now.

But,I have yet to see a post of growing these like the larger Hylocereus.