Help, what is it!?!

Not sure whats going on with one of my seedlings here guys, can you all take a look and let me know what your thoughts are? Thanks a bunch!

Temp: 78 avg
RH: was around 10% added a humidifier today though, and its at about 44%
Lights: T-5 8 Bulb about 4 in from the plant
Soil: Happy Frog, no nutes added only fed with water

I thought that I had the plant too close to the light before, however these spots have been developing on new growth.

Straight Happy Frog no perlite? That may be the issue, also I would check and double check for critters. She looks like she may be ready to go into a new home as well. If you have had her in there 3+ weeks she may be short some N. When you transplant, add some perlite (if I am wrong and you have added it already, can't really tell from the pics) about 3:1 ration and remember she will not need nutes again until a good 3 weeks later. Best of luck!

I transplanted her from a dixie cup about 2 weeks ago, and yes I am using just strait happy frog. Do you think I should transplant again? She is in a 1 gallon bucket currently, I also have a few other plants that have been in veg for a month now that are still in 1 gal buckets too. Do you think its time to transplant them? If so should I stick with happy frog or go for a diff soil, one where I can control the feeding a little better?

Hey man,
I wouldn't do too much right now.......from the looks of things you're doing alot of things right. Depending on how old your bulbs are 4" seems close, those T5's pump out some light.
Generally I don't push them in veg., but I have a flower box. If it were my problem I would back the lights off to a foot or so, bring my Rh in range & get on my nutes.
I'll grow past these problems and cut out any damage next week when there's like 50 leaves.....in my head anyway! I do OK.

take a flashlight and put a leaf on top of the bulb and see what the insides look like.
Looks like you got critters by the holes in the top tissues of the leaves, the brown spots and thats not good. Look to be in the root system drying up anything trying to get into the root system. 10 to 1 ya got bugs crawling around somewhere.

FF Happy Frog is a fine soil. I use it for all my grows, no issues. But it does need to be buffered with inert perlite. As for the transplant, if you just did it and you are having those issues, once again check for critters.

Bugs are a bitch! Your pix aren't steller.

i dont think its the lack of perlite because i never seen a plant do that just because of a lack of perlite..... also your plant is tiny so i cant think it would be a pot size issue..... I looked at pics i didnt see any spider mite dots on the top of the leaves so i dont know how everyone is so sure its a bug problem....... and it dosent sound like a nute burn becuase you said you have only watered with PH water......hhhmmm im interested to see how this plays out...keep us posted....