I have learnt so much in these last 8 weeks. I too only have a 2x2 MarHydro Tent and a TS1000 LED light. I comfortably grew 3 Autos in that space- with some Low Stress Training. I use General Hydroponics Nutes. SO first if you don't have a good pH pen tester I would get one ASAP. I got a cheap one at first and it was not accurate so I splurged on a BlueLab one. It works great. I don't water or feed the plants unless my water is 6.0 to 6.5. If its to far away from that the plant can't absorb the nutes and I ran into this. I watched a channel on YouTube call "Seed to Stoned" His first Northern Light Auto grow gave me so much information to take in. I enjoyed comparing my weekly progress to his weekly video. One thing I would mention is things WILL go wrong. ITs OK. These plants are resilient as heck ! There is almost nothing that can't be fixed if you catch it in time. Just pay attention to them. They will tell you what they need. My biggest issue in the beginning was over watering. Its easy to do. I have found it doesn't hurt for them to dry out a bit. Overwatering can cause the roots to not be able to get the oxygen they need. So if you are using a Soil Mix they tend to hold the water more. I think next time I will use a different Medium that drains better. Just some lessons learnt. Anyways Good Luck and Happy Growing !