Hello orchid friends, I'm having some kind of issue going in in my orchidarium. I believe that it might be fungus, bacteria or insects. I'm leaning towards mites of somekind. I will post a couple pictures of the leaves on some of my plants. Whatever it is, it seems to be going after my Pleurothallids more then my other orchids. Spotting and pitting on top and underside of leaves. I possibly might be under fertilizing too. I use MSU 1/4 strength. I try to fertilize at every watering then every once in a while use straight RO but I have had a lot going on the last few months. I did some searching on the forum and I see people have uses the Bayer products. I when to Home Depot and I found two different Bayer products and I'm not sure which one to use. There a Bayer all in one that says it's a systemic but also a fertilizer and then there's a Bayer 3 in 1 but I don't see systemic on the bottle. I'm gonna post pics of them and of anyone knows which I should use that would be great. Also should I water the plants before I spray and do I spray down in the sphagnum of the potted plants? If I should spray really good and soak the sphagnum. I've lucked out for a really long time and never had a problem. So I don't really have experience with this issue. I'm also not sure if I should dilute the product more becasue I grow sensitive plants. For anyone that's been posting info about the Bayer products your help is very appreciated or anyone that can help! Thank you my orchid friends!