looking for help

Hi everyone this is what i have. 4×4×72 tent 1200w philizon led 6inch 240cfm exhaust fan w/speed control 100 watt ceramic heater Medium fox farm ocean forest My temperatures are 65 light off 71/72 light on. I'm running 18/6 on the light cycle. This is my progress. 10 days from the seed popping

Hey Im new I just started growing hydro And would love some help! I have a drip system I have been growing outdoor for years but new to indoor .. My first plants all died and I am not sure why they were all turning yellow I had the ph right the water was off 15 on 15 that might have been to...