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why does my fish tank water go green arfter ichange it arfter 2 days2007-11-24 23:43:58

Not to get to technical on you but there are bacterias called Nitrosoma and Nitrobacter that breaks down the ammonia (fish urine) produced in your tank. When you clean your tank and do a water change you are removing lots of this bacteria. So the ammonia builds up and your tank stabilizes itself by getting an algae bloom. Shutting off the light will work. But your best bet in my opinion would be to change 20% of the water once a month and then change the filters once a month. The best timing on these two things is 2 weeks apart. First of the month the water, the 3rd week the filter. This will help keep the tank stable.

But for an accurate answer, take a water sample to your local pet store and get it tested for ammonia, nitrite, Nitrate, and PH.

Good luck.

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there are so many reasons you really need to go on to one of the dedicated fish sites I highly recommend thinkfish.com It is great for beginners and even has a section called creator so you really dont make too many mistakes. As you dont say how big your tank is I'd steer clear of plecs unless you can be sure it's a dwarf. My common plec is in a five foot tank and is over 20cms and still growing. I often hear people recommend them even in fish shops but nobody ever says how big they grow. You could also buy green-away which is a treatment for algea bloom

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do you have adequate filtration in there? Sounds like a lack of oxygen to me I had this problem when I had a plastic tank since then I've gone for a glass tank with filtration and do regular water changes(10% per fortnight) you need to use a water condtioner eg: Aquasafe that declorinates the water and makes it safe for your fish.It's taken me a while to suss out how to keep the water clear but get a decent tank do regular maintenance and you should sort it, you'll get some good answers on here i've learn't lots on here by asking questions and it's really helped now my fish are happy clean and healthy.

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If it is a tropical tank and it is set up properly with real plants and the correct amount of fish, including loaches and fish that clean up then you shouldnt change water at all only top up when necessary. Keep out of sunlight and get an aquatic frog.