The algae grows back rapidly after I clean my tank. Whats wrong and how can I fix it?
It is normal for algae to begin to return within two weeks after being removed. Algae multiply rapidly. If, however, algae returns within a day or two, this may indicate a problem with either light or water quality. Algae requires light and nutrients to grow. If the tank receives too much light, is over-fed, or is over-stocked, algae problems will usually occur. If the aquarium is a reef tank using metal halide lighting which is on for twelve hours or more each day, rapid algae growth on the aquarium sides could be normal. You should experiment with photoperiod to see if you can strike a balance between algae growth and the health of the corals. Excessive algae growth on a live-reef structure is not normal. Good water flow and alternating flow should exist in a reef tank. Temperature may need control through use of a chiller. Algae consuming animals should be present in every reef, such as Blue-legged Hermit Crabs, Sally Lightfoot Crabs, Snails, and Urchins. Live rock structures should
