What kind of orchids do you have? My Schomburgkias mounted on palms host big ants without a problem. I found out how nasty than can be years ago when I tried to divide a lovely specimen on a queen palm. I am not sure what role they play, but I have seen no harm. The ones to worry about are the farming kind. We have carpenter ants and they will eat your house and your termites. The ants in my schoms look like carpenters, but they are a different species. We have so many exotic invasive ants that I have lost track of the species. A new myrmecological horror story every year.
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