I would encourage everyone to learn about Aquaponics. Simple definition/explanation: Fish waste/water is used to water/feed plants similarly to hydroponics, but it is much simpler and extremely cheap; the plants effectively filter and add soluble oxygen to the water for the fish.
Space seems cool in the movies, but once you get out there, it is super boring. Now for a fascinating tiny ad:
A rocket mass heater heats your home with one tenth the wood of a conventional wood stove