I noticed today that my N. maxima has developed some brown spots on one of it's leaves. It was not there last night. I did spray down all my plants with neem oil last night after the lights went out. Has anyone ever gotten any brown spots on their plants after using neem oil? This is my 4th application and the plant has never shown spots like this before. Do you think the neem stayed on the leaves and then the leaves were burned when the lights came back on?
Here are some pictures to help out.
The temps in the tank are 24-25c during the day with 80% RH. During the night it's about 15c and 90%+ RH. The plant has been growing in this for over half a year. I have 4 T5 HO 54 tubes above the tank with a 16 hour light cycle. I currently think I have thrips, which I also had during the summer but managed to get rid of them (guess not good enough). The plant was badly attacked during the summer, but the leaves did not look this way. Any help would be great . If you need any extra info just ask me and I can provide it.