We use a juicer daily so just having fresh parsley daily out outdoor growing season will be worth the effort.
What is you cycle on the ebb& flow?
I'l planning on planting in Clay pots for the Goldfish tank. I used to keep Orandas and I'm very much aware of their sanitary habits. I'm planning bare bottom tank or maybe a few river stones on the bottom.
Don you have a link for adg's tank?
I've never kept goldies, and I hope this link works: http://m.youtube.com/watch?v=9zi-Wn5nKi8
I would like to do a similar hardscape only goldie tank with maybe a driftwood branch with anubias designed moreso to be viewed from above, say like a 40 breeder on a 18-24" stand...I would throw in some Japanese trap door snails too, maybe a highfin banded shark since an lfs keeps them with goldies.
My cycle is 15 min on, 45 min off, or 1x tank volume per hour, but I am starting to experiment with a siphon for continuous on. The lights are set opposite the tank lights so there is a more consistent sources of nitrate management. In my next set up I will plant the sump with weeds and floaters (aka goldies food) so that between the 3 cycles I have 24 hour management.
As far as the community notion goes, you could a) have a very large pond and run it like a community aquarium => was thinking giant gourami, tilapia, large mouth bass, fresh water lobster, trap door snail, and one of the giant minows (called sharks by aquarium standards) but amphibians and reptiles are a no go for me due to risk of salmonella or b) Google integrated multi trophic aquaculture => similar to your idea of divided res.
Welcome to the rabbit hole!