Phal Bellina Yellow Spots

[Leafmite]

I like your set up! What a great way to grow orchids! Your temperatures sound good.

I found that with the MSU (for rainwater), I still wasn't getting enough Calcium for some of my orchids. I suffered some signs of Calcium deficiency after I switched to it and I had to begin adding additional Calcium. (I grow Angraecums and Cattleyas which tend to like quite a bit of Calcium). I use it for all of my plants and, a couple of months ago, I saw some signs of magnesium deficiency so I gave my plants a good dose of epsom salts. I think those are the only issues I have with what I am using. It might be the brand of MSU fertilizer I am using, too. No idea.