11-22-2010, 02:15 PM
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That is a lot of light. I expect one tube won't light if the second is taken out, correct? Some fixtures will, others won't.
On floating plants, many of the stem plants work well floating, particularly Pennywort. Just lay the stems across the surface, they will grow like weeds but are easily thinned weekly by snipping off the lower ("Bottom" ends, leaving the tops to continue growing. Wisteria will also grow on the surface. Or you can plant these in the substrate and let them grow up and across the surface; the only drawback of this is that lower leaves get less light and tend to die off, leaving bare stems. Other plants that require less light (crypts, Anubias, Java Fern) can be used on the substrate.