Remember when I pointed out that I was noticing signs of overwatering? Seems the signs of overwatering have now become worse and are starting to progress into a problem. Likely because it looks like you recently watered again?
At first you only had symptoms of overwatering, but it's getting worse now because you keep giving them water when they're good on it. Overwatering causes a load of problems: for one, the roots begin to drown as they become waterlogged. This invites root rot fungi to grow on your roots, but also waterlogs your plant because it's forced to drink excess water. Not only is all that bad, but the excess water the plant is taking up means it is also taking up excess nutrients from the soil as well. And if all of that wasn't bad enough, the excess water in your soil is creating the perfect conditions for anaerobic bacteria which is creating very acidic conditions in your soil. I'd be willing to bet your runoff's pH is sitting between a 5-6.
The overwatering is making your medium quite acidic which locking out nutrients (often appears as a Ca and/or Mg deficiency when it's really just lock out, Ca/Mg are often the first to get locked out). The yellowing lower leaves is N deficiency, the leaves getting lighter and lighter shades of green as they reach toward the edges of the leaf is your Mg deficiency, and those brown necrotic spots are either Ca or Mn deficiencies (likely both), red/purple colored petioles are P deficiency, and the chlorosis is from K deficiency. Yet, despite all of that, the leaves have burned tips and clawing that are synonymous with Nitrogen toxicity. You do not in fact have all of these deficiencies/toxicities, your pH/soil is too acidic because you overwatered. Not only is the constantly moist medium making things too acidic and locking nutrients out, but anaerobic bacteria have likely set up shop as well. Anaerobic bacteria will munch on the organic amendments in your soil, excreting ammonium gas as they eat. The bulk of this ammonium gas leaves your soil, wasting nutrients, while simultaneously causing N "toxicity" because some of the Nitrogen in the ammonium gas is readily available for the plants to uptake. The problem is for sure overwatering, possibly the type of water you're using, but regardless you are for sure overwatering.
What are your watering practices like? How much water does each pot get, and how often? Lay off the water for a few days and leave them alone. Go lift your pots and feel how heavy they are after being watered to runoff. Then wait until the pot feels light, that is when you water. Gonna be another 3-4 days until you actually need to water again most likely. They're still pretty small, so they won't need that much water.
Remember, it is much worse to overwater than to underwater. Overwatering is WAY worse. Worst case scenario with underwatering is the girls get droopy and slightly stressed, goes away within an hour or two of watering though. Overwater too much? Takes day to fix. You would have to go days without watering before these plants finally die, but if you overwater you create acidic soil conditions, root rot, pH fluctuations, nutrient lockout, and create the perfect environment for mold and pests.. fungus gnats specifically.
