Nutrients in a reef, what?
Hello I’m not quite sure what they mean about nutrients in a reef? << No problem. Basically this means "left over food". When you feed your fish or corals little pieces of food don't get consumed. Also, fish waste is another big source of nutrients. All that food and waste break down into simple molecules. The two main items we are usually concerned with are phosphate and ammonia based molecules. These are basically fertilizers for your tank and are the food source for algae, Cyanobacteria and bunch of stuff most aquarists don't want growing their tank. So, to have a clean and healthy reef tank, we need to eliminate, remove, or prevent such nutrients from entering the system. I hope that helps. Adam B.