First grow LSD

Maybe your ph is too low , it's common to start with 5.5 but you need to upgrade the level to 5.8 after 1st week ( rooting ) to makes more nutrients available. Here you have purple stem and purplish leaves on the second node and your leaves are droopy. The droopy leaves could be due to an overwatering , sometimes water input is too important in hydro for a young seedling, maybe you should try to not let the pump on during 24h straight. Concerning the purplish and the pale green it is just because your Ec is too low , in hydro I would already gave 1.2 ec or 0.8 minimum, she needs to eat

Brother if she is just starting to show a few pistils keep giving her grow nutes until she does a bit of stretching then switch her with the bloom nutes. I see your issue with the light green/yellow leaves there are a few things you can try. First change the batteries in your ph pen and re-calibrate with a 7.0 calibration solution. It may be giving you some bad ph readings it happens. Make sure when you make up your mix with the cal/mag you let it sit for about 20 minutes then recheck the ph. I've been faked out by not doing that. Sometimes the ph can bounce from acidic back up closer to 7.0 even after you have corrected it. You can even try testing it after 24 hrs and see what it does it might surprise you. Seems like your nutes have everything the plants need in it. If that is not it you may be underfeeding them which is hard to believe since she is so small try increasing your ppm gradually to see if she greens up. Good luck hope this helps you out. Give me an update in a week. I'll follow you.