Awesome dude, deadly system you have. I'm running a similar set up (not as automatic). I just use 4g/gal megacrop for the flower res and 3g/gal for the veg res. I also add enzymes Komplete to keep the hoses from clogging. Interested in trying mantis, but megacrop is so cheap I bought enough to get me to Christmas, last December. That amount only cost $150.I have 2 pros in wk 8. Last time I changed Rez was when I flipped lol. I just top up daily with fresh nutes and keep the water just under the net pots (filled with Growstones).