what should i use as brush on the side of my panther tank? I have seen pics with some on but I don't know what I should use for mine. thanks. oh yeah, i also made a tank course in the alley by our house. its got some dips (incase it is muddy, not really muddy, but i mean in scale terms) a big hill (i think i might have made it too steep, i can start to hear the motors straining - dont know if i should make is smaller), and a bunch of little hills. i made the hills to big for the panther (low ground clearance) because i can hear the bottom hit them when i go fast. i had to rake it all before hand because it was mostly dirt clumps. i dont know what i should do to get it packed and fine dirt besides walking all over it.