It was strange I have 1 plant that displayed purple colour and that was ready after 65 days of flower or so. The other was totally green but exactly the same aroma and took about 10 days longer. I staggered both though to let the lowers develop
Royal gorilla by RQS, lovely plants.
I'm probably not the best to give advice but how far away are your lights? What type etc? You sure it's heat stress and not something else?
I have just added a bit every third or fourth watering and i have not seen the issues I had the first time round.
Somebody a lot more experienced will be along to provide some better advice though I'm sure.