07-03-2009, 08:43 AM
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How long has the twenty gal tank been up and running? If it is less than three months, Then transferring everything as you described will still warrant testing water to ensure there is no ammonia spike that may harm your fish. If the 20 gal tank is over three months old or is already (cycled) then I see no problem with moving the fish to the larger tank so long as you allow both filters to run on the tank and also add plenty of the gravel from the 20 gal. I wouldn't add water from the twenty gal as there is little benefit in doing so. Im would add everthing I could from the twenty with the exception of the water however. Keepoa close eye out for ammonia spike and feed the fish sparingly. You could always,let the new tank run fishless until the filter in the 20 gal has chance to produce more bacteria. I know that is difficult ,but if the 20 gal has only recently matured,or (cycled) and you swapped out the filter,, You may have threw away a significant portion of the beneficial bacteria and in that case,, Only you can make the decision.
Last edited by 1077; 07-03-2009 at 08:47 AM..