Yeah, that is a good sign. Again, I'd go with a much larger res and if you can keep it out of the grow room that's even better. When do you get your chiller?
Disclaimer: I still use HID and I'm NOT an LED expert. All of my LED knowledge is from other parties or research so I can't say from first hand experience one way or another. I also run a medical grow consulting business in SoCal.
Just a quick update. I have done this weeks res change. I actually did a bit of a flush for a few days. (waiting for the chiller) While the res was empty, I installed the pump and ran the lines through the ceiling.
Got a message from the seller today. Apparently they screwed up on the shipping, and now he has to re-send it. Wtf! He's gonna refund my shipping, and send some other goodies for the hassle, so we'll see.