Auto Gelato - First Indoor

Hi it's Friday and you know what that means! A week has passed since germination and here is my update! As said I was very worried about the TS600 heat and ordered a TS1000 to put the driver outside my tent and it has helped a bunch. My TS1000 is dimmed to around 55%. I bought 2 cheap clip fans that are running constantly not directly on the plants as they are not oscillating. Humidity has been a constant battle, I've put wet sponges and a tray of water in my tent, but it's not enough, so to fix it I always have my exhaust fan off and only when humidity hits 70% I turn it on until it hits 60% and I repeat that constantly manually. I could buy a humidifier but the whole point of this grow is to keep it as low budget as possible. I fed once and I think it was too early as the seedlings showed some spots the next day, as seen on the second picture. But I'm not sure if that's the reason for the spots, feel free to help me diagnose. 1 out of the 3 did not sprout sadly. Feel free to leave any tips or questions! See you next week!