If you are only useing t5's get them has close has possible,this will cause the leaves to grow out and you will get a far better plant.most plants start a little leggy if the lighting is not close enougth.you can either re~pot and put most of the stem under soil,this is the method i would go for or buy kebab skewers and then tie the plant up to support it but you have to be realy careful doing both methods.once the plant is made safe get a slow air flow on it this will toughen the stem.but the most important thing about plants at this age is to get them lights inces of the tops.