Hi. I am running a 10 gallon, have since April.
A single T8 is not going to do it - maybe 2 T8s.
I just put in 2 13w Compact Fluorescent Lights, which I'm finding excellent, although a little bright. I recommend 2 10w CFLs. They are screw-in just like light bulbs and mounted in what is known as brooder reflectors (very dent-prone). The color temperature must be between 6500K and 6700K. I couldn't find them in the local hardware store or Home Depot so I ordered from an internet site - they didn't have 10w. They color temperature is referred to as "daylight" or "full-spectrum", but look for the actual color temperature.