I am always tinkering, but not to go bigger. I like my size and shape tank. My smaller systems, I am always thinking of ways to change, re-plumb, better maintenance, grow better,etc.
I get lost in the maintenance from time to time. I just am doing it in a zen type of mood. I love to get lost in it at times.
I love to watch and dream of when it fills out more, but I always manage to find that one piece that needs to be moved or that side that is not clean enough, or a certain coral would look good here. Tinkering.