Could be getting burnt from the lights. If the brown started around outside of leafs and worked in its nutrients. There’s a great chart with every possible prob what it looks like and how to fix it w no harm I’ll find ya the link.
What did you decide? I live in the in law spot but shower in the main house. No one ever enters that room. At first I wanted to get a bunch of small tents and put them incognito. I think I’ll stick with the bathroom. Mylar in the shower but for a 3’-6’ area (bathroom itself) do I have to shine...