That power supply is sucking more power than your lights!!
Not so, bro. It's using just a little more than what the fan/s are rated. Otherwise where's the extra energy being put out? The power supply would be glowing like a heater (or a light), lol.
Nice grow man. I would keep bubbling the water if there's chlorine in it - it doesn't hurt to do it. Definitely looks like a textbook calcium def to me too.