Co2/Temps/Nutrients

When using supplemental Co2 and higher temps (up to 30C) transpiration increases which increases your plants water needs! Usually at this point of flowering with those high numbers irrigation should be done daily! sometimes even twice a day! Check the top 5cm of the soil and when it's dry it's time to irrigate, so after the next irrigation check the medium daily for that indicator. And the fertilizer needs do not increase!! this will only increase the medium salinity and will cause toxicities! same amount of fertilizer should be used as you normally would but with the more frequent irrigation (every watering solution should be fertilized) enough nutrient are available to the plant! The burns are probably due to improper irrigation or overfeeding! try also reducing the overall fertilizing by about 10-20%. Hope this helps! Good luck and happy growing :)