after this, there was a new problem. Most species of cichlid eat the algae in the lake. But now there are not many cichlids, so there is more algae. Pollution from towns and factories also helps the algae, and today - after fifty yeras - there is five to ten times more algae. When the algae dies, the water cannot move freely. It becomes very dirty. Now the lake is dying, and soon there are not going to be any animals in it. Humans are making the world a dirtier place, and pollution is another danger to animals.