Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
1st tank: How does the wood look in other orientations? Does it stand up?
2nd tank: I would move the vertical portion closer to the middle-back of the tank, perhaps about 12" in. (40b is 36" long, so 12" would be pretty close to the 1/3 of the way.) This might mean swapping places with the smaller and larger pieces, then angling the larger piece so it still fits. It will probably touch the left side. Mostly that part will be hidden by substrate and plants, though.