option 1 sounds more logical and less of a headache.
option 2 would bring us back to the start and we would have to find different fixtures
Will be good if Vader is able to post a topless pic of his tank (lol). Gives us more of a frame of reference.
2 x 36" fixtures obviously won't fit either - would need to go to 24" like you said. Sounding more and more like the black fixture with the black stand!!