If you have excluded pest damage, which I suppose you have, then I would plump for Boron deficiency. Use a liquid feed that contains Boron as a trace element, you could also try a dilute solution of Borax as a quick top up. There was a similar post about Epiphyllums a while back: Here is a link that might be useful: Epiphyllum damage

Hi there, I was able to pick up an unlabeled Panachoi from bunnings but if you're unsure how to identify them your best bet is ebay, there's often lots of cuttings on there which are easy to root (do not water for a year or so). There's a lot of people who claim to sell Peruvianus however it's unlikely that they really are. James.

I have lots of edible seeds. What kinds are you looking for?

Spanish Fly, my pleasure. You know, I was wondering when you think its time to bring them out from the cold frame? I still have mines in a cold room, but not sure when to bring them into a warmer sunnier room. I have been keeping mine at below 50 degrees for weeks now. It is not spring here until march 21st, God, it seems so long away from now. When does your spring start? Is it March 1 ? I am with you. The waiting is killing me. lol I can't wait to see the fire works your cactus do once they are able to bud out!