We made our own bulk heads from 1/2 inch pvc and conduit fittings. Also making our own gasket from a square of rubber we bought at our local hardware store.
To cut the holes in the plastic beds I used a unibit, go slow or you will crack the plastic and have to buy another. Hmmm. How do I know this????
Once its all up, together, running and filled with warm water....Fish move!
I did transplant some mature plants from my greenhouse into the grow beds. We have Dandelion, Arugula, Swiss Chard and Lettuce growing now. And thirty happy, healthy, plump Tilapia.