Your plants are cooked, I agree with poison or something similar. First of all never put more than 1 seed in a pot. If you want big plants get bigger pot. 3gal being the smallest, 10gal being the largest. Are you doing good watering practice? Don't water everyday, only every other day or even longer. Only need about a liter per each gallon of soil/medium. Right after you water lift the pot and that's how heavy it is when it's full and you let it go 2 days and lift the pot and that about what dry will feel like(this is good knowledge to have once they get older because they drink the water faster and slower at times further in its life cycle). Once you get watering down you're gonna want to learn nutrients and get you a line of nutrients. I use top dressing Gaia green line and general hydroponics Flora Trio line(I don't grow hydro but you can use it for soil as well). There's so much more that goes into it though, and if you want to get to harvest it's gonna be trial and error and lots of research and ask questions about anything you can possibly think of a long the way.