Strawberry Cough - Newbie DWC

Nothing much done except for topping her on day1 of this week. Kept lights around 50% @ 16" Ambient temperatures were getting hotter causing the reservoir to heat up, there wasn't enough air running through through the nutrient solution which made it even worse. Low O2 and dangerously high temperatures for sure. Growth kept up however, she put up with it better than my other plant did. Meristem growth seemed great after recovering from the topping but new branches were growing pretty floppy, leaves not really spreading out until they are pretty big. Also getting droopy leaf tips on old fans, low O2 related or maybe too much N? Growing slower than she could due to the issues causing me to run low light to play it safe. Hooked up a more powerful air pump and started the AC more at the end of the week, time to give her all the light she can take. Nutrient solution in EC=0.4 tap (per gallon): 3g Jack's 5-12-26 2g Calcium Nitrate 1g Epsom salt 2ml Silica gold 2ml Fulvex 1/2 tsp per bucket of Great White Phosphoric acid to get to pH 6 EC=2.0, pH=6