Also, why are you building your server in a superflat world? You may want to try and install some mods that help with world editing. One of them will allow you to save entire structures and paste them into other worlds or areas within the world, and it would be a good idea to have some bioms and caves and the like, unless you're building in a superflat world for those who want to have battles with other players on a semi-public (in that only those subscribed to you may join) world. In that case, I'm super fine with that; keepup the good work!