so 30 total watts, over a 40gallon hex, which is taller than normal.
Well, 30 divided by 40 is less than 1. You have about .75 watts per gallon, which is only suitable for the lowest of low light plants: anubias bartari v. nana, java ferns, and some crypt species. I wouldn't even try java fern at that light level unless you float it.
as for fish stocking, that's up to you, but I would avoid anything that's really active, since you're limited on the horizonal swimming space, and most fish like swimming on a horizontal plane more than a vertical plane.
