I've had a lot of help with this from a question I posted on a recent photo upload, but now I think the discussion is getting to the size where it really needs it's own thread.  Here's a LINK to what's already been said.  Thank in advance for all your help. Background: Our aquaponic system is located at a local high school.  We have 50 peppers, 100 strawberries growing in clay beads, and 10 gold…