First of all a good dose of bone meal cant hurt to start up a melon. They are slow in minecraft to begin with. Second of all and this is the part you really need to pay attention to: Right from our rules located at the bottom of your screen is a whole section that says you can not afk farm.
Consider that as well. Happy Melon Farming.
Regarding AFK Farming
If we can prove your focus is not in-game while you are performing game-related action (literally anything except being completely afk), we will consider you bannable. Our methods will include messaging, teleportation, or any other thing to try and get your attention.