What bulbs would I have to get to make it a high light? I know I would have to go to T5s but how many bulbs,watts.
Unless you are going to be injecting CO2 you don't want to exceed medium to medium/low light, about a PAR reading of 50 or less. A T5HO fixture with two (2) each 24 watt 6700K bulbs (48 watts total) would be about right for your needs. Hagen and Coralife both make them.
BTW, yes those are T12 bulbs with starters.....you don't see those anymore.