If there are roots coming out of the bottom then you need to transplant pretty fast.

Also if you notice the growth has stopped - this usually is because there is no more root space to grow. A Transplant will also help with this problem.
MarijuanaMike Reviewed by MarijuanaMike on . Grow Log - AcousticStoner420 - 1ST GROW Whats up guys, Im Acoustic and I have a small indoor compact fluorescent grow system set up... Mind you all this is my very first grow, so feedback and advice would be GREATLY appreciated and helpful to me. Here are the facts on my setup... 2/3 Plant Indoor Grow: Lights: Three 150w CFL's Space: 2ft x 2 ft and about 3ft tall. Medium: Scotts Continuous Feeding Potting Soil Nutes/Ferts: Greenhouse All Purpose Plant Food (15-30-15) Air Flow: 3 Speed Tower input to Grow Box Rating: 5