I'd strongly reccomend a different substrate for keeping plants. Such as gravel or sand. Something they can shoot roots through and anchor themselves in. =]
May I suggest Amazon Swords, Duckweed (floating plant), Java Fern, Hornwort, Java Moss, Crypts, and Dwarf Hair Grass?
All do well in relatively low light. =]
You could get a CFL lamp, get a 5 watt bulb at the store that says it's 6500K and use that for your light. =] I'd keep it on for no more than 8 hours a day because longer could result in algae. Or if you get algae try lowering your light hours. Then again if you get algae you could always just get 1 zebra netrite snail and the little guy should take care of it for you. =]
Or you could try looking up the Walstad planting method. =]
I saw earlier that you were looking to cycle your 2.5's and that's a good way to "cycle" them. =] I'd try it with some ghost shrimp first though to see if it's the thing for you. =]