07-22-2012, 06:51 PM
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I agree. One comment on the plants, the Wisteria is not low light. You may find this difficult, but you can try it (being a stem plant it will not be too expensive) and see. One advantage is that it will grow along the surface, and even completely floating, which is beneficial for Bettas. And the other plants mentioned are low light/shade plants, so they will still manage below.
The problem with bare tubes over water without a glass cover is water evaporating and condensing on the tubes and the fixture; the fixture may rust at the ends, and the tubes might crack when hot if splashed. Some fixtures have a glass cover built in. But compare the prices, for a 20g long you may find a full hood is no more and that will have the glass. If you go with the hood, less expensive yet will be the incandescent rather than fluorescent, though perhaps not much. The CFL Daylight 6500K bulbs are excellent for plants, I have these over my 10g and 20g tanks with good plant growth.