>I picked this unit up from Costco a month or two ago.
So that thing is only 24W of light. You should probably add more white light around it with maybe an LED lamp.
>If I cut back those stems and clear away some of the crowding is the plant salvageable?
No, they are not. The bolting stems is really bad and the nutrient deficiency is too far along. Even if you only had each of the issues separately, they would still be unsalvageable.
I would start over and focus on the nutrient deficiency. These nutrients are pretty standard. Ratio in tablespoons is micro 1, grow 1 1/2 and bloom 1/2
Soil I used was happy frog. Same company as the one you have here but not as hot. Not sure how I feel about it though I wouldn’t. You can give it a shot though. No way to learn but to research as much as you can and just pull the trigger when you’re unsure.
I use this:
General Hydroponics Flora Series: FloraMicro, FloraBloom, FloraGro - 3-Part Hydroponic Nutrient System, 1 qt. Bottles https://www.amazon.com/dp/B09M942WYB/ref=cm_sw_r_apan_i_TBGQ10CHVCE98KHRDA77?_encoding=UTF8&psc=1
And everything thrives, including my houseplants and orchids.
I’ve been using GH Flora series.
You can adjust the component ratios based on the growth stage of the plant.
https://www.amazon.com/dp/B09M942WYB?ref_=cm_sw_r_cp_ud_dp_R7J56M32PDZS7S13T0E2
I also bought some Masterblend after I saw it recommended here, but haven’t tried it yet.
https://www.amazon.com/dp/B072F2BL9D?ref_=cm_sw_r_cp_ud_dp_1QZRRK686W1QGKFB4HYT
I will grab a ppm meter. Any that you suggest? Also I'm using General Hydroponics Flora Series:... https://www.amazon.com/dp/B09M942WYB?ref=ppx_pop_mob_ap_share For my nutes. They were working wonderfully but I'm wondering if they're too strong.