Well, we've had really good luck with the water lettuce. The light is twin-bulb shop light... I'll check out the wattage once I get home. We added some more, and now it's really spreading out and looking great. I was actually going to add an update pic last night, but the light had already gone out for the night. I'll do it this evening, though. I'm surprised at how much success we've had with this... I really didn't know if they would grow or not, but the water lettuce was on sale for a dollar because I guess when it's outside, it would be about time for it to die. Since it's inside, I'm hoping it'll make it through the winter. As for what's in the pond, it's three Pacu and an RTC. Pics of their handsome mugs are in my albums.