Second time grow !

I don’t think it’s low co2, high heat, or light burn causing the severe browning leaf symptoms. The leaves do look like they are dealing with higher temps/high RH... this can cause problems with how she uses the nutrients. Usually you need leads nutrients when it’s hot as the water evaporates faster leaving the nutes at a higher % in the soil. By looking at the plant I would say it’s a K tox. ————— the burnt tips down low is a giveaway. Nitrogen rarely burns the plant it causes leaf mutation. P and K are the main culprits of nutrient burn. We generally don’t add micros in very high % to affect us. Could it be the bat guano causing the issues?

Hey there your buds are looking great, she may just be going through the fade. I did see your high humidity and slightly high night temps, if you can get those down a little I believe it will help with terpenes and trichs. If you're interested in added co2 but dont want the hassle of the traditional way, theres a company that sells living matter that generates cow called The exhale co2. Keep up the amazing work.

Hi! The crispy tips look to be light or nute burn. Maybe try pulling your lights up a few inches & taking a break from the feeding for a while. Her leaves look nice & dark so there's definitely no deficiency. Focus on keeping temperatures at 80 degrees or lower & getting your humidity down to around 40% if at all possible. Flowering plants do not like high humidity as it puts them at risk for rot & powdery mildew. Lots of air circulation with an oscillating fan is ideal at this stage. Other than that, they're looking great!