It certainly sounds like a calcium deficiency. Do you use distilled, RO, or rain water, by any chance?
Use Calimagic at 1 tsp/gal, once a week. If used with fertilizer, add the calimagic to the water, then the fertilizer
Hi Ray - just got my Calimagic, as I use rain water. Can I use this on my orchids that are in moss? And should I use it with every feeding (if I water them more than once per week)?