When they are in growth(ex. leads,developing spike or buds), they like to be evenly moist. But when in flower or not in growth, they like to have a wet and dry waterings. I have one of the brassia. And have high light in the upper levels of the oncidium group but less than cattleya light. And yes, keep it above 50 as they are warm-growing. And regular better-gro water soluable fertilizers would be fine. And when it flowers again do not stake it if you want a natural look. What medium is the brassia in? And what area you live in?

---------- Post added at 03:20 PM ---------- Previous post was at 03:09 PM ----------
And they like humidity also.