nitinarora:
2. I am aware that LEDs in parallel need to have a resistor for every LED. Is it possible to use a single resistor at the anode of every led instead of wiring 3 per LED. I understand that the resistors need to be different since the red led has a lower forward voltage but if I wire a 100 ohm resistor to the anode would it serve the purpose or the red led would just eventually burn out?
Resistor at the cathode? No way. The red LEDs would die long before you got enough light from G+B.
OTOH if I understand it correctly you have a transistor for each color (3 in total) and the cathodes for each color all connect to their corresponding transistor. In this case you could probably connect a resistor to the transistor's collector and connect the cathodes to the other end of the resistor (it's not good engineering practice but it'll probably work).