Ya, that looks like a seed pod, but I am sure it's not... I would rip that off and check the plants for balls.......
As for the yellowing, I see nothing wrong with them, they normally have lighter color leaves when they are semi new and growing quickly like they do in flowering... so unless it gets the color yellow like a magnseium or sulphur problem, I would honestly not worry about it right now
As for the yellowing, I see nothing wrong with them, they normally have lighter color leaves when they are semi new and growing quickly like they do in flowering... so unless it gets the color yellow like a magnseium or sulphur problem, I would honestly not worry about it right now