Just take out the 6 bulbs that aren't over your plants and save some power. That's a lot of wasted light.
Even 1x23w CFL or equivalent LED would be enough for them at this stage. Even with 2 fluoro bars on you're wasting a large percentage of light, especially with your seeds in that configuration. I think you should have put them in a straight line and put them under the middle of two T5's and taken the rest out, then add them back in as the plants grow.