I found this Ranitomeya uakarii tadpole dangling from a Costus amazonicus today. I’m not sure how it ended up here as I check the tank daily and this tadpole looks to be about 10 days old. My best guess is that this Costus grows so fast, the egg was laid in a newly formed leaf and then the leaf unfurled and the egg ended up at the newly horizontal leaf tip. But, no way to know for sure!
Photos taken with microscope camera at Hartwick College, NY. Tadpole was sedated with dose half of what an equivalently sized fish would be sedated with, but very sadly this tadpole did not ever wake up. This was my first and last time using sedatives in amphibians.