Batavia

Not in the capsule, they'll compete with each other. Choose the prettier of the two shoots, which will then grow at ease, and if you really don't want to part with the other, try to transplant it into the ground.

This is a sign that your salad is "going to seed", either because it's too old, or because it's too far from the light. In the 1st case, eat it; in the 2nd, move it a little closer to the luminaire.

This phenomenon, which occurs with lettuce that's too old, can also be explained by too much light or a lack of oxygen. Make sure your lettuce is 10cm from the light and in a well-ventilated room.