Well i ran into some problems, water temps too high over the weekend (i wasn't there) but roots and plant still looked healthy despise 24,5°C water temp over 2 days. I added 2,5ml each Hydro A & B on day 15. EC rised to 0,89 / PPM 445 and two days later ppm still the same i guess because the only part of the root touching the water couldn't uptake any nutes because of the high water temp? (everything above the water looks healthy af tho) Since my apartment is usually really hot in the summer i bought a TEC peltier water cooler + pump and a thermo regulator to ensure the water temps will stay between 20 and 21°C. i just need to wire that up and diy saved me me a lot of money. i payed about 100€ and have automatic temperature control and a cooler from amazon about 200+ € so i think its fine. I'll show you the set up once it's completed and works. Its the best budget cooling i could get my hands on imo. Today is Day 19 my parts came and i really managed it to half ass wire shit and not burning down something. wish me luck. I payed a total of 93,22€ and now got a really quiet, 150w DIY Peltier/TEC) cooler that automatically turns on once the water temp hits 21°C (69,8F) and stops when hitting 20°C. So far its working REALLY well. like im amazed and so proud i managed to do that and it was pretty easy. i had big problems with temps in my attic flat and water temps quickly rising to 24° and more which means root rot. Since i use the cooler all new roots just looking healthy as fuck. the plant is growing well and i see every day progress. So i saved a shit ton of money. the cheapest water cooler i could find on amazon was around 350+€. Sure it bet it works better, is safer to touch, not very likely to cause burning down my house because i had to twist copper wires together and let 230V run trough it BUT no way i have that much money for things like that. The cooler cools water temps from 21,5° to 20° in about 15minutes. the longer it runs the better it cools. i bought a temperature controller outlet ( 25€) which let me set 2 temps and it turning the cooler on and off. I had to cool it down manually every 2 hours before with frozen water bottles💀 So here are the stats for day 19: Water Temps: 20-21°C / pH: 5.42 / PPM: 485 / EC: 0.96 / height: 2,5cm (lol) (i added some more Hydro A and B because i thought i maybe see some nitrogen deficiency) i bet i will see some RAPID growth now since everything is dialed in, hopefully lol 150g im coming!