It looks fine.
Don't stress over those first round leaves that pop out of the seed first- as soon as it sprouts a new set then they are pretty much useless. I can't tell you what is wrong from those pictures, but it really doesn't matter unless it happens to your true leaves.
You mentioned nutrients- be very careful fertilizing seedlings that are under 2 weeks old. Everyone's potting mix is different but generally there is already enough in the mix to raise the seedling for at east a week if not longer. So generally unless you know what you are doing hold of with the fert until it looks like a plant not a shoot.
You need to get yourself some picture charts or photo sets that show you what under and over fertilization of various elements looks like. Google it, various people have put collections together for easy reference.
As for your light- you are using the right thing don't change it! People will tell you to use CFL or what not to avoid stressing your seedlings but let me just tell you instead that all you need to do is keep the lamp at the right distance. Again I recommend you do some googling and find out the correct distance for when it's a seedling, then a small plant then the optimum closeness for when the plant is established. Using a MH you will have great fat healthy stems and fast compact growth- you go CFL and you'll most likely get a lankier slower growing weed. Just remember what you read as instructions will be just a guide and you yourself will have to check on the results and test the temperature to see if the distance is appropriate for your rig. You are better off having the light a bit further away and lose out on light then have it put more than 35 degrees Celsius on your plants. Don't let people tell you it won't work because I use a 600w HID from day one with great results and i've seen people use a 1000W.
Watering- twice a day sounds way too much, especially for a plant that doesn't even have roots to suck the medium dry. You want to water the pot in wet so it runs off a little bit and then leave it without watering again until it's still slightly moist but about to cross over to dry. See ideally you want the medium to be always moist but not wet. When it's wet, like you can squeeze water out of it, then the oxygen level is really low. Roots need oxygen so just like you don't want your head under water too long plants don't want it either. On the same token plants bring in nutrients with water and are constantly sweating out of their leaves (you'll see this water build up and sit on leaves if air flow is bad) so need to keep bringing in more so if you let the root zone sit with no water too long then the plants foliage will dry out. You need to find the balance between the two.
Go find some guides or even buy a book about all the fundamentals. Don't try to just figure it out as you go, you'll just learn how to make mistakes.
