Nice job. About AC from your psu. I did the same, tapped into the psu switch for AC. If the psu is on, so is my pump. I also added an extra safety feature. If the pumps not plugged into the psu the computer wont turn on. Its very easy to do, you just take the green wire in psu that goes to the m/b and run it thru the 2 unused terminals on the molex like so:
If you want to run without pump plugged in, you can use a jumper or have a second molex making only the green side.
peace.
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