Suggest a LOT of reading. Here, Wet Web Media, anything by Sprung, Fenner, Michael, Calfo, Schmoyer; to name a few.
I've done some reading, but could likely use more. Are any of them particularly good for large tanks? That's probably the area I've had the hardest time finding much info. There's plenty of X, Y and Z are great for doing A, B and C, but when I go to look into them for my tank, I find out that X, Y and Z cost several hundred or even a thousand dollars to setup each unit which is designed for tanks up to say 150g or so or else need way more space than I can realistically give. Definitely seems like some things that work great don't scale well.