This is my 1st grow as am facing few problems as h...

Hey invest in some isolating fans that are compact but powerful. You could run your lights at night when it is cooler and raise those lights up higher to reduce the heat being pushed on your plants. She looks good and healthy do u have an carbon scrubber? Open up all the vents in your tent and raise lights heat will dissipate for you hopefully ...

For me this is showing slight signs of a few things here firstly I would check the run off of your plants to ensure your PH is at the right spot . In a organic soil medium I would suggest 6.5 - 6.8 this will allow your plant to absorb all the micro nutrients and nutrients in the medium without causing a lock out ( lock out is when you either have to much salt on the roots preventing it from absorbing nutrients or the PH is fluxuating to much and is also creating the same effect as a salt build up). Once you have measured the PH I would also measure the PPM of the water , this will help you determine if your plants are being fed too much , there are guidelines to the amount of PPM's you want in your water for various stages of growth . You can find PH meters and PPM meters in lots of places , Amazon , Walmart ,local garden shops , they're quite common . You can find these PPM charts on google as well for a reference guide . Once you establish which is the problem you can correct the amount of PPM by feeding just regular PH'd water ( water that has been corrected to the proper PH ) and this over time will help break down the salts on the roots and allow your plant to absorb all that its supposed too . If PH is the problem then your might want to consider adding dolomite lime to help balance out the PH or you can simply correct your water before putting it in the medium ( example your at 7 and you wanna go down to 6.8 but you have already corrected it to 6.8 , try correcting the water to 6.6 and this should bring down the medium to a 6.8 . Its going to be alot of math doing this way but it can be done .) Lastly to answer your question about your fans , in a 3x3 I would suggest that you use 1 4 inch fan as your exhaust and 1 4 inch fan as your intake , this will keep the air balanced in your grow room and have it cycling properly so your plants get fresh air all the time. I hope this information helps you on your quest to becoming a grow master ! -Happy Growing!

I wont be so much concrened atm. What is see is your soil the" problem". It might be a very good organic one be. But not for seedlings. I see that picture often .Your plant looking like having ph problems, .....so the plant cant absorb what they need. Other possibility is, the soil is to rich in nutrients and leaves show a lockout. solution is the same, get for your next grow avery" poor" or light soil for growing MJ... with the right ec and Ph for mj... you go either with abiobizz/ plagron lightmix or mix your soil by your own. i leave you a nice rciepe in the comments. Solution for the moment... either you transplant them into " poorer / and more stabilizing soil, b) you stabilize your soil in ph with adding dolomite lime , and addig coc for fluffiness. Or you just let them grow..

I think this is a Nitrogen deficiency but it's not so serious ;) you are doing good mate Good grow ;)