06-16-2010, 12:50 PM
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I agree, you have a filter, that is your water movement machinery, the plants provide the oxygen--no need for more gadgetry especially as it can be detrimental to plants.
I can't tell from the photos, but if your tank has a frame around the top that has a lip on the inside, the glass cover can sit on that. Glass covers are available for most sized tanks and are not expensive. The front pane is either hinged (on smaller sizes like 10g, 20g) or slides back, allowing for easy feeding. The light then remains on the upper edge of the frame with the glass down on the lip. If that makes sense.