Thanks! I had seeds for loads of different varieties, not all made it unfortunately.

Yes, you're right about the composting bit but it only matters if you're using it on the same plant family. Most diseases are plant family specific so you can use tomato and potato compost to grow strawberries for example. I'm composting them for growing shrubs and trees and for a steady supply of earth worms for fishing:)

My toms are growing hydroponically on inorganic medium anyway; I haven't decided yet if I want to reuse that medium or not. They do not have any diseases I can identify but if I reuse the growing medium I will soak it in a peroxide or a bleach solution to kill off most things.