This is a video of me, Tasselfoot, beating BTD5 Bloons Tower Defense 5 on Hard Mode, Track 5, Without losing a life. Track 5 is Advanced 1, the Lava Stage. I do use bloonberry bushes, although you definitely don't need to.
Video is on 3x speed.
Game: http://ninjakiwi.com/Games/Tower-Defense/Play/Bloons-Tower-Defense-5.html