abax: I don't think mine is lack of cal/mag either as I am using MSU fertilizer and reverse osmosis water. I also have given some cal-mag plus recently. My viral test kits arrived today. I'll let you know what they show. The brown leaf tips are actually a bit of burn I believe. I am in Arizona and my swamp cooler went out for about 30 mins one day when it was like 110 and the greenhouse quickly overheated for about 30 mins, several of my plants have some burns from that day. The sphagnum that it is in is new so I don't think that's the problem. They like a little higher pH water so I have dressed the top with oyster shell to try and increase the pH a bit. I hope it's not a virus. I had been looking for one of these for a long time and finally found this one to buy, I'll be sick if it dies......