08-04-2009, 07:05 PM
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On the cycling, you could set up the 10g tank with fresh water (don't use water from existing tanks, there is no value in this [as the bacteria colonize objects not water], quite the opposite because pathogens and waste will be entering the new tank unnecessarily) and add the established tank filter media, rocks, plants [bacteria will be living on/in all this], use a good biological supplement [I am not familiar with Biozyme but I have had excellent success with Seachem's "Stability" and Hagen/Nutrafin's "Cycle"] and add the three black neons at the same time. The bacteria on the rocks and in the filter and added via the supplement will handle the ammonia produced by the neons, and then the nitrite. Give the tank a week and if all is well, the betta can be added. You will probably not notice any ammonia or nitrite readings as the bacteria will be present in sufficient numbers to handle that produced by the three neons.
With respect to the betta and neons combination, I have read cautions about keeping bettas and tetras together, so I will leave this for the experienced betta keepers to comment.