I get "bored" with my tanks too, and though you do need to set up another tank (
) you will need to address the issue of the current tank, as you don't want to start neglecting it. Do what I do and re-do the aquascape. I do the same thing with the rooms in my house, as I get bored wtih the configuration of furniture and decorative items.
When my tanks get like that for me I lower the water level, remove large objects that can be easily removed, like driftwood and rocks, and net the fish. Everything goes into a bucket filled with tank water temporarily, usually separate buckets for each (driftwood/rocks in one bucket, plants in another, fish in another with the floating plants in with the fish). I remove the planted plants gently and set them in a bucket too. I would only recommend this for a well established tank that has been stable for a good long while. This procedure is the same as what you do when you move a tank.
This is a good opportunity to adjust the placement of the tank and stand in the room, if necessary, and replace styrofoam under the tank if it has it, etc. Also if you want to add better quality substrate to the existing it is a good time to do that, especially when it comes to a planted tank.
Fill the tank and start redecorating. Change things up in terms of where you place your objects, where the caves are, etc. Plants that may have gotten too large for the old position in the tank can be moved to the back, etc. I do this several times a year for most of my tanks and if done carefully you won't experience a cycle.
