"Controlled testing"? It's all "controlled testing", whether it's one tank or several. And the cost could be distributed among several smaller tanks, using a single EC unit.
Wow, you are a professional... just like I thought... How is your business doing?
I actually asked pretty much this same question to F&T, do you want to know what their response was? No, you'd rather make assumptions based off your professional work raising shrimp....