And that's not black. Its purple. Genetics or the leaf surface temperatures are on the colder side. LST should be between 74.5°F up to 81.5°F. About 60%-50% humidity.
K yeah I’m thinking nut burn but I had a thirp problem but I don’t think they do that damage my leaves r dieing but only on the tops closest to the light could it be the light intensity my ppm is hot at7.4 /7.6
Lots of hung up fly paper. AzaMax is you want. Cut the fly paper into 4" sections. Lay them around the base of the plant. Change them out every 4-5 days.