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You don't say how many goldfish you have, but it should be fine, just keep your eye on your water parameters and do waters changes as needed.
Are you breaking down the upstairs tank? That would mean you'd have to cycle it again.
I would try putting the filter (this would help with the increased bio load) or just the filter media if you have to, in the downstairs tank along with your gravel (you can put this in clean pantyhose and hang it in the tank) to try and save as much bacteria as you can.
If you put the wheel in a bucket, you'll have to feed it and make sure the water doesn't get cold and kill off the bacteria.
Good luck.
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