Phototropism is the growth of organisms in response to light. It is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs. This causes the plant to have elongated cells on the farthest side from the light. Phototropism is one of the many plant tropisms or movements which respond to external stimuli. Growth towards a light source is called positive phototropism, while growth away from light is called negative phototropism. Most plant shoots exhibit positive phototropism, while roots usually exhibit negative phototropism, although gravitropism may play a larger role in root behavior and growth. Some vine shoot tips exhibit negative phototropism, which allows them to grow towards dark, solid objects and climb them.
My plant therefore has been showing this phenomena and I have been amazed of the growth of the plant. The plant with the isolated fish seems to be growing in an upright manner so this means light is probably being received in all angles. ( http://en.wikipedia.org/wiki/Phototropism )