If this link works maybe it can give you somewhat of an idea. Its my 55 gallon when I didn't have many plants. I would set it up about the same but put the red temple on one of the sides and the Cabomba on the opposite side. Spread them from front to back. Let the hornwort get trapped somewhere, though IMO I'd get rid of it.
http://i3.photobucket.com/albums/y51/IceH2Oinmyveins/Im000963.jpg
http://i3.photobucket.com/albums/y51/IceH2Oinmyveins/Im000963.jpg
