Got the first of 10 or 12 tubs up on the roof and cycled. I will be taking all the chief yellow lace's fry and putting them in there to grow over the summer months and select the next breeding generation.
The screened overflow is more for when it rains so the tub doesn't overflow taking fry with it. It also allows me to use a hose to do a partial water change if it doesn't rain for a a week or two.
The media in the bottle is already cycled. The large bio-media logs are being seeded for the sump of my panda loach breeding rack.
For time being I am using a regular dual outlet air pump. Once I get to more than 4 tubs on the roof I will buy a smaller central airpump of about 30L/min to run them.
Here are the airline outlets and hosing I ordered. Also in the box is 10 small, screened, PVC, bulkhead outlets.