First little grow

Well hello fellow growers. Consider the current Covid-19 lockdown, supplies of the magic herb are uncertain, so I decided to embark on the journey of attempting to grow my own weed. I had build a small grow space in a garden shed last summer, but had never completed the setup. It's basically a 60x60x140cm (2x2x4 feet) timber box, lined with mylar on the internal walls. I am using a small cooltube, vented out to a fan and filter on a shelf outside the grow box. I decided to go with HID lights, as my research concluded this was the bast proven source of lighting. The LED scene is still in development, as far as I am concerned. I have a Philips HPIT-plus 250W MH for my veg stage, and a 400W Philips son-t+ HPS bulb for the flowering stage. I hope the 400w does not generate too much heat for my small grow space. I have a good extractor fan pulling air through the grow tube, so the plan is that the extractor will pull most of the heat from the grow space for me. I have chosen a Lumatek 400W dimmable ballast, so it the heat is too much, Plan-B is to swap out the 400W HPS for a 250w. The fan is a G-Tools temp adjustable 400m3 - so my hope is that this will be more than enough to keep the temp down. So I got me a three pack of feminised Northern Lights from the Sensi Seed Bank, as they seemed to tick all the right boxes for me. Beginner friendly, mould resistant, Fast flowering time, short and bushy, good yield, and multiple cup-winner, what's not to like right. I am going to attempt a soil grow, using cloth 'smart-pots'. I have chosen 'Plagron' for my medium and fertilisers, as I would like to do a fully organic grow. So My biggest decision at this stage was one plant or two ? - I decided to go with two - In case of disaster. So.. That's my setup basically. Now the grow. I used the paper towel method for germination. (Two saucers with damp paper towel, wrapped in a towel sat on top of my fish tank for warmth) Three days later and both seeds are well sprouted with a good sized tap root. Straight into a small pot with some bubble wrap to reduce the amount of soil for the seedlings. I used commoner DIY store potting compost, as the salesman in the grow-shop advised me that the soil I had bought for my grow (Plagron growmix) might be a little strong for seedlings. So I went with the potting compost for stage one. Placed the pots on my windowsill... and they had emerged the following day, wearing their seed cases like little hats ;) The journey has begun. The next day they were placed into the grow cabinet with the 250W MH light about 45cm above.