Cover the tank top with thin plastic drop cloth (get it at paint stores, Lowe's, etc) and seal up all openings with tape. If you have an open filter system, turn it off and cover it with plastic and tape too. Wrap the sealed up tank with more plastic sheeting. Assuming you have plants and light and your tank's not overstocked, there should be enough oxygen supply for a day or so.
Dan Dixon
***************************** Waveform Technology UNIX Systems Administrator
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