Air pumps are an essential piece of equipment for fish tanks, as they provide the much-needed oxygen that fish need to survive. However, it is possible for an air pump to be too strong for a fish tank. If the air pump is creating too much flow in the tank, it can stress out the fish and make it difficult for them to swim and breathe properly. In extreme cases, this can even lead to death. It is important to carefully monitor the flow rate of your air pump and make sure it is not creating too much movement in the water.