This has become a wide-scale problem the world over. Feeding fish or any other species can lead to them becoming reliant upon that food source. It makes fish more aggressive towards divers and can lead to species interacting with others which they wouldn't natrually come into contact with. It can also lead to corals getting smothered in algae as fish no longer eat the algae but eat the food instead. It also increases the amount of nutrients in the water leading to an inbalance within the ecosystem.