I like Pro-Mix HP personally.
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While a lot of people cross themselves and sprinkle holy water when they hear "MiracleGro", and while I wouldn't use it myself, it does work. And apparently the organic version is not that bad.
So, especially if you are less invested in the outcome for those particular plants (the bag seeds, right?), I wouldn't feel too guilty about it. You don't have much to lose.
I feel like those are kinda like your practice plants! Lol I dunno I have 3 bag seed plants and while I am trying my hardest, I'm also trying not to beat myself up about it if not everything is perfect quite yet.
The 1st and 4th are the auto GSC the middle pics are of the bag seed... Ive added new homes added nutrients idk what else to do for them...They look happy in the first and 4th picture, but the middle two look kinda droopy