Its a thread mainly aimed for guys who want to DIY electronic/eletrical items to use on their aquariums.
R 3 C A stands for:
Reef Central Computer Controller Automater
So anything automated and DIY should go in here, i just think its not very well placed on the forum page and it took me a long time to realise it was here.
See my link in my Signiture to see about an automated DIY reef controller if your still unsure.
Hope this helps,
VR