Advice Welcome - First Time Grower - Northern Lights - Indoor / Closet

Hey there. Rookie here.
Back in 2007 I researched many hours here on RIU and geared up for a first grow which never happened. After coming across a 10 year old bag of feminized seeds which germinated I'm playing catch up with information and equipment which have definitely advanced some.
Any advice is welcome.

The equipment that has been in storage:

So far I've surprisingly and successfully germinated 2 ancient seeds by paper towel / double plates. The taproots were noticable so rushed out to find soil before the big box stores closed. Ended up splitting a bag of Miracle Grow Seed Starting Soil between two 10 inch pots.

Both have been under the T8's for around 2 1/2 weeks until 2 days ago when they were switched to the 600w MH. Definitely heat scorched them before moving the light up. It looks like nute burn but I'm not positive because it happened directly after they switched from CFLs to HID and the taller of the pair got it worse. They now have 2 fans blowing across the tops and I'm looking into setting up the ducting with a real inline fan to cool the hood and ditching the booster fan. I also see that MH conversion bulbs are no longer recommended.

What do you guys think would be good next steps to start on? Much appreciated

I'm not sure what the overall issue is but I can tell you that Miracle Grow is not a good medium to grow in. You should switch out the soil for normal non treated soil. Miracle Grow has nutrients added and can cause issues.

as an experiment repot some to Fox Farm ocean forest with 25% perlite

the ideal mix these days

you'll never use the Mg crap again

good luck

The one thing with MG is it has high levels of nitrogen as veggies like a higher concerntrate of nutrients.
After all MG isn't recognised as being specialised in cannabis growing, so stay away.vostoks got it right.

Thanks guys. I checked the fert analysis of the MG seed mix and it lists 0.03 - 0.03 - 0.03, so it's looking more like heat burn after all. Canopy temp is down to 82 from 96. Still working on it.
The hydro shop and home depot here were both out of plain perlite but picked up a bag of ocean forest and did a transplant and stepped up the pot size. The root system was decent and just starting to circle.
The FF looks and smells healthy.