Tillandsias in general grow like weeds in the dew zone of coastal Southern California:
1 No copper. Not in fertilizer, hangers, water sources. But weak fertilizer is good occasionally.
2 If you get nightly dew, just hang it in a tree in part sun/part shade. Stand back. In S Cal this is on the coast side of the coastal hills, or just a little inland from there.
3 If you don't live in a dew zone, you need to spray it with water almost every night, but it needs to get dry between waterings.
4 No full sun unless humidity is sky-high (which is almost never is in S Cal.) Otherwise, dappled sun is best. Full sun in Laguna Beach, Pacific Beach, Oceanside, San Clemente... you get the picture.
5 Don't put it in a high-humidity terrarium. It requires very bright light and almost daily drying out.
6 Night temperatures over about 80 for more than a few days are often fatal.
7 No frost.
A general exception is T. recurvata, "ball moss." It takes a lot more sun than most.
As to your questions... Yes, hanging against sunny walls in S Cal will probably kill it. Metal hangers are fine if they have no copper. You can use dental floss to attach Tillandsias to trees. Hang them from their little stems and they will figure it out.
I would guess most Tillandsias die from being too wet or too dry for too long, too sunny, or too hot at night.
If you ever visit an area where Tillandsias live in habitat, you'll understand right away.
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