03-19-2013, 11:08 PM
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Apologies if this was mentioned and I missed it, but what type of filtration do you have? If the surface of your water is very turbulent, some floaters - like frogbit and WaterSprite - won't thrive. I was able to somewhat get around this by creating a 'corral' for the floating plants, an area where the surface of the water was calm. Duckweed doesn't mind anything much, though - and it will most certainly thrive in the lighting you have, provided you can keep it out of the filter (really shouldn't be much of a problem unless you have a HOB, in my experience)
Just to add. . . I have a tank with a single T8, and I'm really unable to grow most stem plants in there - especially not with the floaters adding more shade. I also have soft water, which can come into play, depending on the species. I have had very good luck with the lower light plants, crypts, anubias, java fern - they have continued to grow and thrive, despite the floaters further reducing the lighting to the bottom of the tank.