Sometimes it seems like jellyfish are bright because their bodies spread light. But most of the jellyfish are not bright by themselves. The light and the colours are very important elements for making a jellyfish tank attractive. This is why our tanks have a built-in LED light with different colours. But there is a jellyfish type which is able to produce its own green light. It’s the Aequorea Victoria. She is able to produce a green fluorescent light. The bright proteins have already been produced with genetic engineering. The nobel prize of chemistry in the year 2008 of Osamu Shimomura, Martin Chalfie and Roger Tsien was for the discovery and further development of the fluorescent proteins.