Have no clue what's wrong!

Hey I'm a 1st grower and need some advice! I got a seedling that's about 2wks+ and seems very short! The 1st true leaves were fine but now they gotten a lil bigger they started turning a little yellow inside the leaves and eventually has some brown spots on them! The second pair of leaves came but are starting to look deformed! I use a bubbleponics system and my PPM is around 450 with floral series nuts! I run 400 watt MH! Please help!

Haha mine usually seem to stretch like crazy.light isn't too close or ph issue?

I'm really not sure what wrong with it. Seems an ok size for 2 weeks. The leafs look funny maybe the humidity is too high/low.

The RH is about 46-48%! The temp is about 75 to 80 degrees! Just increased nutes to about 750ppm! Leaves look a little greener but are still droopy! Anymore suggestions! Plz help!

What are the genetics of the plant?
Maybe it is some weird runt of the litter from some unknown strain.

750 ppm is way too high for a 2 week old seedling. On the one hand the spots could point to a deficiency, but the plants is a little young for that level of nutes. I use plain water for 2.5-3 weeks, then go to 300 ppm. At 4 weeks I go to 400 ppm, etc, until at 8 weeks they're at 800 ppm. So you're almost at the same level of nutes I'd give a full-grown plant.

What is the ph of the water?

The Ph of the water is around 5.8-6! The age of the plant is a guess because I really didn't plan for that to sprout seeing it was a freebie seed from an order! Which is funny the ones I paid for never germinated! I'm thinking about the flushing the plant with plain water and readjusting nutes! You think that's a good idea! I posted another pic of what it looks like now! I'm using a bubbleponics system and going by the chart on the floral series nutes at half strength for recirculating setups!