Hello there!  I'm new to the group, but am excited to learn more about aquaponics here!I've got a small "Barrelponics" system that I've set up to try and learn about aquaponics and work the bugs out so that I can take it overseas.  I modified it slightly because I want to set up systems with no moving parts, and that system uses a toilet flush valve to flood the growbeds.  I switched to a simple,…