Moist build up at bottom - overwatered

Should use small plastic pots to start with until you have 2-3 good internodes. The tiny seedling has very small roots that are barely developed, they need water but gravity pulls moisture 12-18 inch down, too far for tiny seedling, Starting off in small plastic creates strong rootball as roots circle round n round within the little pot. All the water it needs sits within reach. Moisture that sits at bottom of pots..... Either roots suck it up or evaporation takes it away. If you keep your temps above 77 ambient, your asking for trouble, bacterial growth explodes above 77. If you keep RH above 50 your asking for trouble. Water less but more frequently until she gets bigger. Looks like she could use a little more light too tbh.

I could spray it with Alga Mic from biobizz against stress. Don't know if it will help.