The tank looks awesome now, I wouldn't redo it, but maybe tweak? It could use some background plants behind the existing hardscape, maybe split some of the swords to fill in, and try putting Java fern or something on the driftwood? I just think that center-right area looks a little underdeveloped. The amount of hardscape you have now is great, maybe just something to fill in that empty background pocket.
Then again, if you have been looking at it for a while.... I usually only last a few months before I move everything around for better or worse.