New Seeds, No New Fish

5th grade's long, leafy, green lettuce began to look like this during the last week of January:

We found out that leaf lettuce comes to maturity after about 40 days. Since we planted ours in October, we should have harvested them around Winter Break. But keeping them in the Aquaponics system a month longer caused them to become less than appetizing.

On January 29, we planted new seeds in our peat pods: a lettuce seed designed just for hydroponics systems, cilantro, basil, spinach, and squash. When the seeds have sprouted to about 3-4 inches long, we will transfer them into the Aquaponics system and start all over again with new, healthy plants!  This time, we'll be sure to harvest our plants before they wilt.

Here is what we wonder:
-Will the different seeds sprout at the same rate?
-Which sprouts will need the most sunlight (so we can place them in the middle of the Aquaponics system)?
-Will the new lettuce seeds really grow better than our first lettuce plants?
-Will having so many different types of plants affect the health of the fish?
-When will the fish lay its eggs?