Yeah get the T5 5.0 since you can get it now. And I would order the higher strength bulb.Yes he's inside. I have to go to work in the morning 8am so I can't really let him out into the sun. I think the T5 5.0 is the best option at the moment. As for the slow growth, I guess it can't be helped.
As for the growth... No, not if it is genetic.