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This review is from: Mini Jellyfish Lamp (DIY & Tools)
Took me ages to get the 'jelly fish' to move around the tank. Even with no air bubbles they didn't do much until a couple of days later when the water had no bubbles. Batteries don't last long so it requires rechargeable batteries. Looks nice when its working but not worth the faff. Should return product really as its just sitting on a cupboard doing nothing but not worth the effort for the money.