This would be easy to do. The secret is simple. Clear acrylic disappears in water. You need to make an acrylic tank that seals all the way around except for a feeding tube, and oxygen tube in and out, and a filter tube in and out. You need the fish in the container before it is sealed. I would use silicone glue on the top piece of acrylic. This is easy to remove if the fish needs to be replaced. The rest of the acrylic would be bonded with a high strength epoxy. I would make an acrylic tank about 3 gallons, and then put extensions on the sides so that there was an inch of acrylic above the tank. Put water in the top inch for watering the snake. The fish would appear to be swimming in the dish, when in reality it would be swimming under it. Use a syringe to push food into the closed tank. Remember, since the tank is a closed system, your air and water inputs must have corresponding outputs. Water changes can be done by drawing water off of the fill leg until the container is half full, then allowing water to flow in on the draw leg.
With a water pump, filtration system, flexible clear piping, three way valves, a syringe, acrylic sheeting, epoxy, silicone, air stone and a whisper air pump you are probably looking at 70 to 100 dollars.
David
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