What i am wondering is: will they continue to grow through the bottom of the pots, the plants are not very big and yet they are already poking through. If they grow any farther down they will hit the bottom of the tray and start polking through the sides. It has arleady happened to one plant and its roots are being exposed to the light. I was thinking if it really got bad i could put a thin layer of clay pellets or rockwool on the bottom of the tray around the pots but I dont know if this would be a good idea, any ideas?