soil PH test: wrong
mag sul def: WRONG
not using fish emulsion: EXTREMELY WRONG
People, please stop giving advice on things you dont understand at all. First of all, the reason those plants are not growing is because of a combination of transplant shock and temperature, maybe along with the roots testing out the waters below. what is the soil temp? did you know phosphorous locks at lower temps? phosphorous is needed for root growth and for general impetus of growth, and is one of the main reasons nothing grows in cold soil! if the mix is 50% compost and 50% PH inert, then the PH is whatever compost is as it degrades, i.e. 5.5-6.5 more or less, which is fine. compost is usually loaded with magnesium and sulfur. your plants need a broad spectrum of stuff that they will get over time from the soil matter breakdown. mix the fish emulsion with the seaweed to give a good balanced impossible to burn fertilizer. more importantly, stop obsessing over plants that look fine, and dont kill them with over treatment, or rashly following overzealous fools online. add some sand for drainage and weight and add some powdered calcium carbonate to raise the PH to slightly alkaline. if you require instant growth regardless of weather conditions, then put them back in a window inside where the temp is consistently above a certain threshold.