So I am upgrading my small tank from 29 to 37 gallons. I don't want to mix the CA cichlids and Danios in with the African cichlids. However the spot and stand where the 29 sits is the same one I'm going to use for the 37. I don't have a way of saving all of the water and just transferring everything within a few hours and I also want to use sand in the new tank whereas right now the 29 has gravel in it. How long can I have them live in a 5 gallon bucket? I would put the filter in it and some rocks and a heater........but I don't think that would be very fun for them. I wanted the tank to cycle a bit before putting fish in it if possible. I can't easily move the filter either because I would need it for the bucket with the fish in it........unless you think it would be ok to use the filter from the new tank in the bucket and put my old HOB filter on the new tank to get some bacteria cycling in there faster?