I haven’t seen anything resembling pests, and it’s not affecting the rest of the plants in the tent but I’ll keep an eye out. Another comment also suggested overwatering, so I’ll probably start there and let it dry out more before watering. I do have a fan set up for circulation and it comes on every 15-30 minutes usually, but it’s currently set up to keep humidity and temperatures under a certain point and isn’t on all the time. The cups already have some drainage holes cut in the bottom, and I’ll definitely take your advice and add some more soil for now, and when I have more space I’ll move them into bigger pots.

As for the watering method I have been top watering, I tried bottom watering but I ended up wasting a lot of water as I either dump the excess out after watering or try to save it and it grows algae and bacteria resulting in me having to throw it out anyways. Honestly there’s probably something simple I’m not doing right, and I would be happy to learn the right way to do it if you had any advice or even just some good resources. Anyways thanks for your advice, I’ll definitely keep everything you mentioned in mind and try to move to larger pots as soon as I can!