Looks good sherry! Have you thought about rotating each 180° and reversing sides? That would give you a sort of triangle in the corner to which you could build your water fall in. And your other tank just needs some decent plants in there. I have a plant in mind, but i have to get you the name of it when i get home after work.
And yes, working on cars for a living is a pita. I specialize in diagnostics, so my world is full of frustration......lol