Aquarium filters and sterilizers help control algae. Biofilters keep water healthy for fish; without a biofilter, water can turn green. Diatom/micron filters help turn green water clear. Protein skimmers filter aquarium water and remove the organic matter that algae feed on. A UV sterilizer is another solution for excessive algae in a fish tank. Water passing through a UV filter is exposed to light that kills the algae. A UV sterilizer doesn't control algae attached to surfaces in a tank, but it controls algae spores and helps prevent growth; it kills aquatic microorganisms that pass through it but does not eliminate dead algae from the tank like a filter would.
Aquarium Algae Control: Controlling Algae in Aquariums
I also had to admit that the tank was getting way too many hours of artificial light each day, because I often forgot to turn the tank lights off, or wasn’t home to do it. As a result the lights sometimes stayed on for a dozen or more hours, something that wasn’t necessary in a fish-only system. (If your tank contains plants or coral, you obviously have to take their needs into account when adjusting the lighting, but in such tanks algae is less likely to be a problem because the other out-compete the algae for nutrients.)
How to Control Aquarium Algae - The Spruce
Many living things in both freshwater and marine tanks (such as snails) eat algae, and would perish if there was none in your tank at all. Therefore, getting rid of all algae is not the goal and some algae is not harmful.What most of us don't like about algae is simply that it isn't very attractive, grows on our rock and other decoration, and causes us extra work. For the most part, other than just being a bother, the algae in your tank in not harmful. However, it can create certain conditions in your tank that will cause harm.Below are a few things you are likely to experience where algae can can cause problems.The above means there is a reason to keep algae at a minimum in your tank other than just the fact it is unsightly.Algae is in your tank because conditions in your tank are right to promote its growth. There's plenty of light, and nutrients for the algae to use as a food source and thus proliferate.It's clear where the light comes from, but where do the nutrients come from? They come from the food you put in the tank and the waste produced by the livestock. Therefore over feeding, and overstocking a tank can increase the algal growth dramatically. You can manually remove the algae with a scraper or scrubber of some sort. Make sure if your tank is made from acrylic that the tool you use is safe and won't scratch the tank surface. Many nice tanks have been ruined in this way.Another method is using livestock to remove the algae for you. Certain snails, crabs, shrimp and fish eat algae, by having the right "clean up crew" in your tank they can do much of the work for you, usually leaving just a bit on the glass to be easily removed. Choose wisely because the clean up crew becomes part of the bio-load in the tank.Of course scraping algae off the sides of your tank gets it off the glass, but when you want to know how to get rid of algae, that's probably not what you mean, you're probably thinking of a more long term solution, something to keep algae at a minimum.Below are the basic steps you can take and the pros and/or cons of each. Too much of any one method can cause problems in the tank, but by using some of each methodWhat the best solutions really come down to is reducing the bio-load. Waste builds up nutrients which the algae feed off of and in turn grow out of control. Find a way to reduce the bio-load and you will have success in reducing algae.
10 Easy Ways to Control Algae Growth in Your Aquarium - Pet Education