Please do not put fish into lamps. The water within the lamp most certainly will get hot, too hot for the fish, then it will cool rapidly to room temperature when the lam is not on. Constant temperature changes as well as lack of filtration will cause the fish develop ick (a parasite) and eventually die. All these “whimsical” lamps, stands and fish tank tables are created with design as a primary purpose and with the fish’s wellbeing as less then secondary. But a life, even that of a lowly feeder goldfish is not a toy and it sure will get depressing after a while to remove their lifeless bodies out of furniture.