Agreed about the temps. I doubt its anything other than the soil didnt have enough to get it through.
The kelp tea wouldn't be enough on its own if they're hungry. Not sure what you fed it already but in the future mix in some ammendments before you plant.
In a 20l pot... I'm not sure what size plant youre going for but if your aim is water only you cant get too big unless you do a couple well timed top dresses. Even then you're limited.
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