Our system has been running for about five weeks.  We used an IBC tote, have 150 gallons of water with 10- 4" tilapia and 20- 2" tilipia.  We are growing lettuce, spinach, broccoli and strawberries in the grow bed.  Everything seems to be going well; fish are alive and so are plants.

I am driving myself crazy trying to understand the ppm of all these components.  I have read so many different things that I am having nightmares about numbers and ppm.

Using Ph down we have our…