Dyranty,

You just entered the stretch phase and they are going to triple in size. In a Rubbermaid grow I think you need to continue LST its entire growth phase. It is not uncommon for a plant to grow more than an inch a day for up to 4 weeks just after starting the flower cycle. After about the 4th week of flower they begin to crown out and growth slows to a stop at about week 5. These are not exact times but a good reference point.