Aquaponics setup - 75% done!

I probably have just one more weekend of fiddling before my aquaponics setup is fully functional. The continuous flow half is up and running and I started my lettuce yesterday. I also inoculated the flood and drain grow beds with some vermicastings and worms in the hopes I've introduced necessary nitrifying bacteria. The pipe fittings are not glued yet as I'm still tweaking the system. I've yet to connect the fish tank pump and of course, I still need to get some fish! Almost there!

Edited: Cement mixing tubs, while not obviously made for other purposes, should be vetted for fish and food safety before using. The brand I purchased is fish safe and materials it is made of suggests it is food safe as well.