You can change directly from 18/6 to 12/12, that's what i do, but sure they stretch, maybe not the double of size, but they stretch for sure.
Fhydro
fhydro Reviewed by fhydro on . Changing to 12/12 My plants are at about 15", My question is when changing to 12/12 will my plants double in size? When changing to 12/12 should I drop the times slowly to get to the 12/12 cycle or should I go straight from 18/6 to 12/12? Rating: 5