*LOL*...yep it will be a challenge

I cycle my tanks using fish...so generally they are in there from day 1 (naturally very understocked)....i do small water changes often during the cycle to help the tank stabilise, and to keep it safe for the fish. The 4ft took 5 weeks to fully cycle

The 5ft should only go through a mini cycle all going well. The water that is in the 4ft will be kept and put into the 5ft, so i will only have to top it up with new water. The filter will be kept running in a large bin, so the bacteria stay alive.

While i'm pulling down the 4ft, the 5ft has to get the stand & hood at the least varnished (maybe stained)...It should be dry before it is needed *L*

The 5ft is going in the same place as the 4ft. So absolutely everything has to come out of the 4, to be stored in bins, then the 4 moved elsewhere. The 5 then bought in and put where the 4 was and then everything moved back from the bins to the new tank.