I'm actually planning to get a backhoe for a couple years to build a large basalt greenhouse, then do aquaponics - combine growing fish and plants in something

I'm actually planning to get a backhoe for a couple years to build a large basalt greenhouse, then do aquaponics - combine growing fish and plants in something that removes most of the downsides of aquaculture and hydroponics. Done properly, it's a synthetic pond ecosystem that doesn't require flushing the water ever.