Does anyone have a greenhouse with a hydroponic setup?
I ran dutch buckets in mine for a good many years, it's a quick and easy setup, works great for cucumbers, tomatoes, peppers, zucchini and greenbeans. I also grew out a few Pindo palm tree seedlings in it.
I've got a simple set up: 100 gallon guppy pond where I grow water plants to feed my ducks and chickens greens through the winter. You can certainly pump that pond water through another container that you've filled with lava rock or clay pebbles, allowing it to spill back into the pond, and grow all sorts of things. We've used Uniseal rubber bulkheads to plumb barrels, flower pots and stock tanks- they're cheap and work great!