Hey friend, you are growing indoor and if there is no pests or insects in your tent, that could be due to accidentally damge the leaves at young age.I have many leaves damaged like that due to accidentally touch at young.They only come to visible when they are large.Happy Growing... ✌️
Si tienes alguna foto más clara, no se distingue bien lo que deseas mostrar. De todas forma podrías inspeccionar por debajo de la hoja de que vaya a ser alguna plaga, tanto de día como de noche es bueno hacer una revisión