It just stopped growing and the leaves drooped. It stopped growing after 13 or 14 days and is now 25 days old. I am very tempted to remove

soil pH? too much feed? bad watering habits (less likely after looking through diary -- seems to havea wet-dry cycle on top layer, which is good) --do you also make sure there are not dry pockets... water does 'even' out on its own in a substrate, but it's a context ripe for buildup of nutes if it is too large of a proportion of the total. Do a runoff and slurry for pH and EC. These are not precise methods, but if somethign is crazy bad, it should hint at it. Expect early runoff to be a bit higher than what is actually in the substrate. a slurry you need to try to be consistent over time so you can interpret it the same way each time... similar volume of water at a specific pH using the same volume of soil... Based on how far it moves the stock pH of what you use, you can infer if it is high low or somewhere near correct. you'd have to calculate the dose of what you feed in ppm to draw more accurate conclusions about what you have been feeding to determine potential cause of what you see or not, unless you have an extreme familiarity with what you are using, then you could use basic observances with decent confidence.