Getting very worried now! Please help?

Lets date this back to the beginning , just before I left my student house to return home for the festive period I noticed a small dark brown seed in my bag of buds, as a joke I planted it in my household plants pot.
Before leaving the house I threw the plant outside for the bin-men to collect as it was mostly dead anyway.

HOWEVER! this part gets really strange upon my return 2 1/2 weeks later after -5 tempretures, heavy winds, frosty nights and heavy rain I go out the back to have a cigarette and my friend ( who didn't know about me planting the seed ) points out a weird plant that has sprouted in the pot.
I suddenly remember what it was and was astounded at how it germinated and grew 2-3 inch's tall with 2 embryo leaves and 2 tiny leaves sprouting from the middle in these conditions. I brought the sapling inside and planted on the window edge so it

Iv came across several problems I need help troubleshooting please

My conditions and set up is a little like this

120 x 120 x 200 Mylar lined grow tent for indoors, I use;
- Duel spectrum 125W CFL with reflector
- 100w Large CFL hanging next to it.
- Age tap water for watering every 3-4 days
- 2 1/2 gallon plant pot with drainage holes
- mix of Biobizz, miricle grow and perlite soil ( I suspect to be the problem )
- Nutrients was diluted baby bio NPK 10.6 - 4.6 - 1.6
- Have two holes in my tent alongside a 30W desktop fan for ventilation

I have healthy Amphetamine automatic, amnesia automatic and berry ryder automatic seedlings in the same enviroment, I do mention I smoke indoors if that accounts for something?

My main issue is the :

1. Slow growth
2. What I thought was nute burns ( probabaly is as the soil has nutes and I tried putting in one of them autofeeders aswel! )
3. Yellowing tips ( even on new leafs )

Was wondering if anybody has any advice would truley be appreciated!
the age of my plant is now 60 days ( excluding the first 30 days due to stunted growth )

Noobus said:

My main issue is the :

1. Slow growth
2. What I thought was nute burns ( probabaly is as the soil has nutes and I tried putting in one of them autofeeders aswel! )
3. Yellowing tips ( even on new leafs )

Was wondering if anybody has any advice would truley be appreciated!
the age of my plant is now 60 days ( excluding the first 30 days due to stunted growth )

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1. They will probably always grow slow. When they start out stunted in poor conditions they usually dont fully recover.
2 & 3. Sounds and looks like a little nute burn. I wouldn't worry too much about it.

Thanks for the reply! , yeh it is growing slow, but I was wondering is a soil change ( if possible ) or some better nutes/feeding routines would pick it up, its always been a healthy looking plant until the other day.

Back off the nutrients a little and let it use whats in the soil. Add nutes back in when needed by the plant.

I dont know if I'd repot them, dont want to stress them anymore than you have to.

I read that you couldn't get nute burn off organic nutes which iv been feeding them? or is that wrong?

Pretty sure that is not true. Someone can correct me if I'm wrong, but that doesn't sound right to me.