Cream Mandarine XL Auto & Jack 47 Auto

Humidity has risen naturally in the tent in the past few days so the humidifier is doing less work and using a bit less water. The odor has also increased. There was a very slight plant smell last week you'd have to strain to notice. There's now a nice green whiff you can't miss, every time I open the tent. Yesterday (day 30) on the Cream Mandarine XL Auto in coco, I noticed some spots on one of the largest leaves:Yesterday (day 30) on the Cream Mandarine XL Auto in coco, I noticed some spots on one of the largest leaves. I checked around the plant on the other side and found similar spots on the same node (4) which were a little worse. I am not sure what has caused this so I am keeping a very close eye on it and taking photos every day to monitor changes. I have turned the Blumat tap down slightly too in case it is a little overwatered, which I thought it might be. The Blumat had an accidental drip-through on day 22 where an extra litre of water went on the plant and fully saturated the coco, and I had to reset the dripper, so this could be a slightly delayed result. Today is day 33. The compost plants both look like they could do with some food adding to their next watering, so I will add some Biobizz Bio Bloom when I do that tomorrow. I've been monitoring the leaf spots on the Cream Mandarine XL Auto in coco. Those leaves haven't deteriorated, and the spots pictured look the same today, however a few more spots have developed on a couple of newer leaves in the past couple of days. One new patch that appeared today. The problem is developing little by little and doesn't seem severe, so I don't want to do anything drastic. In absence of any better ideas I have upped the EC in the nutrient mix for this plant to 1.2 while dialing back the tap to make the coco a tiny bit dryer. The Jack 47 Auto in coco is still on EC 1.1. For both coco plants I have changed the mix as they have started flowering, to a 1:1:1 Micro:Gro:Bloom ratio. The water quality report for 2017 for my area is available online. It states the calcium content was a mean of 44 mg Ca/l with a minimum of 32 and maximum of 36. The magnesium levels were an average of 7.2 mg Mg/l and ranged between 6.3 and 8.8. The water company describe the water as "slightly hard". I am not sure, but I take the numbers to mean I have a little bit of calcium and magnesium in the water but not lots. It might make sense that it needs supplementing. For the compost plants, I have added 0.5ml/l Magne-Cal + as well as 1ml/l Bio Bloom to the watering they have received today. To attempt to keep magnesium available, all plants have been treated today with a spray of epsom salts. Foliar feeding was suggested to me in my last diary by uk420 users and this is the first time I have tried it. I added about half a teaspoon of it to 300ml of water and sprayed it on this afternoon, then left the lights off for a couple of hours. I might repeat this again before the flowers get any further along.