Anna, I also am amazed at all the blooms on your Epis- awesome!
I have a large ackermanii, a couple years with me now. Red bloom. Winter has it in the basement, summer it hangs in a dogwood tree. New this year, two smaller ones of another one that has pink bloom, a hybrid or maybe Disocactus- pink- picture from the mother plant. I am still learning with these. This summer I pruned all the long branches in hopes that it would fill out instead of having just those super long stems. I think I need to fertilize much better, now, seeing Anna's.