I am very interested in this product. I have a few questions though, can this be run from the overflow drain? Or should it be hooked up to a pump directly? I was going to run a carbon pellet reactor, but I would imagine with this product, I would not need to do the pellet reactor? I have not seen much conversation on using these two products together. Also, I am sure you it is somewhere on this site, but how do you minimize the needed addition of Kalc into your tank due to the algae scrubber?