I have a 46 bow and started with a Satellite 36" on it. That provided what I considered a medium amount of light sitting an inch above the edge of a 21" high tank. That sounds right for your low tech set up. Stay with low to medium light plants such as anubis, vals, swords, crypts, etc. You can use moss as most of them do well with less light. Stay away from most if not all your carpeting plants because they need a lot of light to fill in properly.