Went the chemilizer route and I'm draining with a pump on float switches in the sump. Water dumps to the flowerbed out front. Doing 40gal a day on the 300 for now. Drilling the growouts and building a pump station for them to collect in very soon. That will be pumping into the j-trap under the sink. This is going to make the hobby so much nicer! Pics in a few...
be sure to get nitrate readings now and then again in a few weeks