I use them in my big enclosures, with no problems. They provide good shade, and branching. Plus veil might snack on the fruit when ripe.Also guava trees are ok for the enclosure?
I believe some orchids are safe like the phalaenopsis the only bad thing is they're pretty difficult to take care of unless you know how to. I've used orchids in my cham cages but my veiled ate the flowers and i currently have one orchid in my pygmy vivarium but its no bloomed.
I use them in my big enclosures, with no problems. They provide good shade, and branching. Plus veil might snack on the fruit when ripe.