10 Easy Ways to Control Algae Growth in Your Aquarium - Pet Education

This video from Fluval has some great tips to prevent algae growth in your aquarium.
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To sum up: under stock, feed appropriately, use purified water when your tap water is suspect, perform regular partial water changes, maintain the filter and vacuum that substrate to help limit the amount of foods available to the algae. Keep your water parameters in line with what you are keeping too. For example, saltwater aquarium keepers should try to keep pH in a range of 8.2 - 8.5, sg at around 1.024 - 1.025, calcium at around 420 ppm and alkalinity at around 2.5 meq/L. If you still have a problem with algae growth test the nitrate and phosphate levels. Figure out why these levels are elevated and then fix them. Even after doing all of the above you will still have algae growth in your tank, but it should be much less than before and more easily maintained.
As you might know, tap water consists of  which can lead to the growth of algae in the aquarium.
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Algae can come into your tank from many sources. Anything that goes into your tank that has been in another aquarium or natural body of water could potentially have algae on it. This includes plants, fish, snails, or any other living thing in your aquarium—including the water they came in with. Fish, shrimp, and most animals will be your least likely culprits. The shells of snails often have algae growing on them. Plants, as well as any decorations and equipment that have been in another aquarium, will most likely have some types of algae growing on them. There is even debate in the aquarium community as to what extent airborne spores might play in bringing algae in to the aquarium. Algae is very small and can come in to your tank from many sources. There are three elements that are directly linked with the growth of algae in aquariums:-
Photo provided by FlickrRed algae especially grow on live rocks and even plant leaves which can make them look quite unsightly in the aquarium.
Photo provided by FlickrToo much red light could stimulate algae growth in the aquarium. In this case we are talking about 4000 K.
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If you have ever had an overgrowth of algae in your fish tank, you know how difficult it can be to remove. A little bit of algae is not such a bad thing; it can add a touch of natural realism to your aquarium. Without addressing the algae, however, you could soon find you’re a mess in your tank. Luckily, there are some simple ways to keep algae under control that do not require too much time or effort.First, aquarium algae is not necessarily a bad thing. Algae grows very easily when given the right conditions and some day we all may be singing the praises of algae. There is research going on even as you read this article for using algae as an alternative energy source. Cool stuff indeed. But an abundance of algae growth in the aquarium usually means that something is out of whack. Overstocking, not performing enough partial water changes, overfeeding or feeding improperly, not changing out filter cartridges and not using pure water are usually the prime suspects.Aquarium Algae Control - So you have had your aquarium set up for some time now and you notice aquarium algae growing on the glass, rocks and ornaments in the tank. Why is this happening and what are some of the methods we can use to control aquarium algae growth in the aquarium?
Get a Phosphate Test Kit. This might be considered one of the most important nutrients for many kinds of aquarium algae growth. Phosphate (PO4) can enter the aquarium from tap water, fish food and supplements. One of the first things you should look at is how much you are feeding the tank. Are you overfeeding? Only give your fish as much food as they will eat in a minute or two. Are you defrosting and draining the juice from the frozen foods you use? These juices could be loaded with phosphates. Are you using food that are low in phosphates? Test them to see for yourself. At minimum, use a bowl to feed frozen foods and tilt the bowl at an angle so the juices drain to the low side and then spoon feed the chunks to the fish. Dispose of the frozen fish food juices down the drain.