Help! First grow, couple problems (Pics)

Hi guys, first post.. been browsing for a long, long time. Anyways, it's my first grow and I'm having a couple problems and hoping some of you can help me out. I've read through shitloads of stuff on here and ICMag and I'm still a little confused.

I'm growing Lowryder. Out of 3 beans, this is the only one to sprout and SHE! showed me sex a couple days ago. :D She's at 22 days. The soil is Scott's Potting Soil (0-1-0) and I added Perlite to the mix. I haven't added any nutes yet, but after transplanting her last night into a 1 gal. pot I added a 5 drops/gallon of Superthrive. Lights just got changed from 4-27 watt CFL (6500K) to 4-42 watt CFLs (2700K) always on 18/6. Night temps: 70 Day temps: ~78-85. Don't know the humidity. I corrected the PH after the first couple waterings and now it's down to around 6.8. She gets watered when the soil is pretty damn dry.

These problems have been occurring over the past week long before the transplant. She's got some purple/dark spots around her leaf edges, with a slight yellowing/brown to them, and it almost has a shiny hue to it. Her roots are healthy, stem and branches are strong. She's still growing, doesn't seem stunted.. but then again it's my first grow and I'm still a n00b.

I was thinking it's a phosphorus def. because of the purpling around the leaf edges and slight yellowing. But then I thought it might be potassium. *sigh* Or maybe I'm just completely wrong! lol. The nutes I DO have are Alaska Fish Em. (5-1-1), and then Shultz Plant Food w/ Micronutrients (10-15-10) for flowering. I thought of adding some Shultz to her watering last night to help with maybe the potential? Potash problem, but I wanted to get some opinions first. Also, on the new growth tips, they are a little dark. That just showed up within the last 2 days.

I just watered her throughly last night so that's why her leaves are a little droopy, normally they're not.. or it might just be transplant shock. Anyways, here are the pics and hopefully some of you guys can help me out! Hopefully I can save her!

Sorry I can't be of much help. I'm learning plant diagnosis too, and not about to offer advice that may be misleading. However, stinky, pharmacan, or any one of the many highly experienced growers here, should be along soon. Best of luck!

day 22......add nutes!!!!!!!!! its been 3 weeks!

I think right now your overall problem is you haven't added any nutes yet. you have a decent sized plant already and its probably sucked up all the nutes in the soil......
add nutes with more Nitrogen than P or K.....

now I may be jumping to conclusions but by the looks of the slightly raised edges on the frills that your plants may be suffering from lack of water/too much heat.........but its hard to tell