Coral will transform the look of your aquarium to something beautiful. However, remember that they are living things and without food, they will die. When they are in the ocean there is plenty of food but once they are taken to man-made environments you have to sort this out. The corals feed on phytoplankton. In simple terms, these are microalgae. They make up the lowest level of the food chain. They drift in the ocean and convert light energy and carbon dioxide to glucose. Actually, their name comes from the Greek language which means plant drifters. Being primary producers, they make their own food and the living things on the higher levels of the food chain depend on them. You should go ahead and get phytoplankton for the sake of the aquarium instead of listening to the naysayers. Note that the phytoplankton is at the bottom of the food chain which makes them the perfect addition to the aquarium. In order to boost population growth in the aquarium or pond you do not need to bring in more organisms but rather ensure there is enough phytoplankton for every one of them. Additionally, this is how you end up with a healthy tank.
Also, if you have corals in the tank you need to add phytoplankton. Not to say every coral species feeds on phytoplankton but a lot of them do. Nonetheless, it will be wrong of you to wait for too long before adding the phytoplankton because it will not do you any good. You should do research on the phytoplankton that are best for the corals before you acquire them. Also, you will notice that the visibility in the tank will become much better if you add phytoplankton. Clear water is crucial for the survival of marine life. Without light, there cannot be photosynthesis. Poor water visibility hinders the penetration of light. You do not have to sweat this because it is a problem you can solve by adding phytoplankton to the water. Additionally, there will be no need for you to keep adding food into the tank. Sometimes you may forget and you do not want the organisms to suffer. Phytoplankton will do this for you. These planktons are not added at once but rather you should try dosing. Try different techniques in order to know the ideal amount you should use in the dosing. Also, storing them in the refrigerator will keep them vital.