help!

i'm doing my first grow in my closet. my plant is 2ft 8in. my main stem seems strong but alot of the branches seem week, it's getting close for it to bud. how do i make them stronger? i have a fan on the plant. i;m useing 85watt 65k daylight for veg. and a 85watt 30k warm for bloom. cfl spiral's. this is a hydroponic grow.

this is a hydroponic grow.

To make the stems n branches stronger,, I'd use some silicon in my tank,, also i'd increase the air flow with a bigger fan or a few smaller ones.... this will make the plants sway in the brezze!! thus making the stems stronger!! The silicon helps to increse cell strucher in plants!!!!
Hope this helps,,
Atb S...

thank you man.