Hi - welcome from the chilly UK! I have a small hydroponic setup. Unfortunately I had a problem with my rockwool and the set up and (of the four plants I started) two of the plants are, effectively, a month or so behind the other two. When I move the first two to a 12/12 light cycle will I have to put the slower two into a separate 18/6 light cycle set up? Would a 12/12 mess them up - they are still very small. I assume so. Advice appreciated. PS Any alternative to rockwool - I haven't found it great. Thanks guys