You probably need to get a different fixture entirely for the t-5s are they High-output or normal-output? T-5 s are much brighter and better for growing plants. For a cheap t-5 fixture look up odyssea t-5 lighting fixtures. I got one for my 55 gallon two years ago at $60 and still run it (switching bulbs every 8months-1year of course) without problems and can grow most plants. Hope this helped but if it didn't just tell me and I'll see if I can help more.
55 gallon Planted Tank - 10 gallon Reef - 5.5 Pea Puffer
2015 AA Fantasy Football Champion