This is why the ideal location to set up your fish tank is away from direct sunlight. It’s basically inviting green water into your aquarium! It can be easy to miss while you are at work, but during the day time, the sun can shine through your windows, basking your aquarium in light. They don’t cost much and will turn the lights on and off automatically, without any effort from you.īut it’s not just your aquarium lighting that could be responsible for your green water problem. Rather than constantly turning your light on and off (and forgetting!), I recommend buying a good aquarium timer for your tank. So, for many of you, reducing the amount of light your aquarium receives will be all that is needed to stop the green water from appearing in your aquarium. Seriously, I have seen grow-lights installed on tanks with fake plants! It always surprises me just how many people keep their aquarium lights on 24/7 when 8 to 12 hours of light a day is more than enough for most aquariums.Īnother common mistake is using a light that is too strong for your aquarium. Too much light could be the very reason your aquarium water keeps turning green. Staying on top of these causes will go a long way toward preventing green aquarium water. The general consensus among the aquarium community is that there are three main causes of green water algae. While the algae that makes up green aquarium water feeds on many of the same nutrients that your plants do, it shouldn’t cause any direct harm. In fact, many fish happily live in green-colored water in their natural environment. Green aquarium water is not considered dangerous to fish. Is green aquarium water dangerous to your fish and plants? Algae typically appears when there is an imbalance of nutrients, and it is possible to have more than one type in your tank at a time. Note: Take care when identifying the algae in your aquarium. Think you might have green dust algae instead? Don’t worry! I also have a detailed guide on getting rid of green dust algae. If it’s a cloudy green color, then it’s probably the algae commonly referred to as green aquarium water. If it’s clear, you likely have green dust algae. The algae in green aquarium water, prefers to float through your water, without settling on any surfaces.īecause of this, the two can be identified by taking a sample of water from your aquarium. The aquarium water looks clear again because the water itself doesn’t contain any algae, just the surfaces. It just looks green from the light reflecting off the green dust algae that is covering every corner of your aquarium.īelow you see what happens when you clean green dust algae off a single panel of glass. And because of this, the water in your aquarium isn’t actually green. It doesn’t like to float through your water. It will happily cover your aquarium glass, plants, substrate and anything else in your aquarium. Telling the two apart is actually very simple. On the left, you have green aquarium water, and on the right, you have a tank covered in green dust algae. If green dust algae is left to grow, then the two look nearly identical… Green aquarium water is sometimes confused with a different type of algae:Īnd, I can see why. I’ll show you how to do exactly that later in this guide.īut first, I want to make sure that what you are dealing with is actually green aquarium water… Rest assured, it’s the same stuff – green aquarium water.Īs you see, you want to get on top of this type of algae before it takes over your aquarium. If you don’t do anything about it, then the algae bloom can get so bad that it blocks out everything in your aquarium…ĭepending on the lighting and what you have inside your tank, your water may have a yellowish-green color… But as they grow in number, they will turn the water into a cloudy green mess….
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