I moved them into radicle bags 3 gallon. I have my jalapeno peppers soaking up extra light. first pic is 5 shriekers at exactly day 14 and next pic is master cookies by HTG and 3 of the 9lb hammer from jinxproof genetics. gave them all mycorhizal fungi
If your plants are already at 18in you should switch soon if in a tent. This is because plants will double to triple in size once switched to flower and you need to maintain a certain distance between your lights and your canopy.