Unless you really work at it, the light intensity will vary in most tanks from spot to spot. So it is kind of up to you to look it over and decide if you are happy with the plants and where they are. Some in the front might want more while some in the back might want less but I would not make a big decision out of 8 inches one way or the other.
Centered might be better but the light location is not one of my bigger concerns.
Centered might be better but the light location is not one of my bigger concerns.
