11-15-2011, 01:47 PM
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Your light is fine. I have the same basic thing over my 29g, a single T8 tube 24 inches (think it is 20w, they are standard for the length). With a daylight tube you will be able to grow many plants adequately.
Floating plants are almost always a benefit. Most of the fish we maintain occur in dimly-lit waters, neons being one of those. They may be still adjusting to a new environment, and that can take a while. But normally they will be more comfortable with floating plants, a "roof" over them, so I would look into something like Water Sprite. Brazilian Pennywort, a stem plant, actually grows very well floating, I now have it in several tanks. Having some large plants in the substrate also helps; swords like Echinodorus bleherae and Echinodorus major work well.