OK, I was reading about people bringing their orchids in when it gets colder than 55F....eek...I can't bring mine in and it's supposed to be 47-50F tonight and has been that a couple nights here and there over the last few weeks...none of my 'chids seem to be sad but is there a tipping point? Anything I should watch for? Mine are all mounted on an immovable wall of driftwood....I have some Dendros, some Phals, an Oncidium, a few Cats (and two unknown "rescues" from a trash pile...)