of the many problems coral reefs face; one solution is to move cold water from lower in the ocean onto the coral reefs thereby keeping at least a seed group alive. this is done with wave motion the rise and fall of waves will create movement in a rocking boat. this design uses two floats held in place by concrete anchors. as the reef pump sways back and forth from the waves the pendulum weight moves the piston to pump the water. piping does the rest; BUT lateral lines to release the water onto the coral must be kept from damaging it. FEEDING THE CORAL is likely necessary, and you need to do this as best you can. but remember like everything else; more food/ more life/ more food.