1st time DWC, 2nd time growing

Hey there, Here is my first time trying to grow DWC, and my 2nd time growing weed. My 1st time growing was in soil. Here is my setup: - 16"X16"X48" grow tent - Roleadro 300w LED - General Hydroponics Flora - General Hydroponics CALiMAGic - Advanced Nutrients Voodoo Juice - Clay Pebbles - Water Pump, 160 GPH - Active Aqua Air Pump, 2 Outlets, 3W, 7.8 L/min - 2 of EcoPlus Round Air Stone, Large - Botanicare HYDROGUARD First, I put everything that I'm going to use in 6.0 pH water (air stones, rockwool, water pump event the tubes), and I washed caly many times for day, then I germinated my seed in adjusted pH cup of water for 12 hrs and then I placed in the rockwool that was in 28th last month I kept 1" between the net pot and the rockwool, and I kept about 2" from the bottom of the net pot and top of the water. I have about 10 litters in 19 litters reservoir, I will add 2 more litters after I remove the water pump. I know my tent is too small but I need to keep it hidden as I can. The first 5 days was hard to manage the temperature and humidity. My first grow was in larger tent and it was easy to manage. That's it for my 1st week. Gl you all <3

Hey there again :)), Today, the plant completed two weeks since germination. Everything is going well so far, I got root rot on because the reservoir is transparent and there was light goes through it but I took care of it. There was delay on my package which was included the Hydroguard and Voodoo Juice. I cleaned the roots and I covered the reservoir with a towel to get rid of it till next water change so I can cover it with "Aluminum" as your answered you guys to my question last week. I was facing many issues during the 2nd week, and trying to discover & manage the environment in my tent and the reservoir. One of these issue is the leaves are getting brown spots which I think is the calcium deficiency because my pH in the first days was 5.6 - 5.8 and as I read "calcium is best absorbed by the roots in the 6.2 – 6.5 pH range", so I raised my pH now to 6. My second issue, leaves are being twisted which I think because of the light heat. My tent is too small and I'm using 300W LED and the distance between the plant and the light and I raised the distance to 26" And that's all what's going on with my plant. BTW, nutrients used for 2 gallons of water no as it said above ml/l. Thanks,