Ah ok! Thanks for clarifying that fungus!
I'll definately be putting a resistor on each LED.
http://led.linear1.org/led.wiz says that a 15ohm resistor on each LED will dissipate 216mW per resistor which I guess leaves the TLC hardly anything to dissipate- does that soudn right to you? I thought I'd try and double check this and looked up resistor dissipation on wikipedia and got this equation 
but it's midnight here and my brain isn't working too well- I'll take another look in the morning.