My tank turned green please help - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 7 Old 05-29-2014, 04:30 PM Thread Starter
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My tank turned green please help

hey guys I'm having an issue with one of my tanks. First off I have a total of 3 tanks. 1 saltwater and 2 freshwater. the 2 freshwater one is 75gal and the other is 150 gal. the 2 freshwater get a partial water change once a month. Ive been doing the exact same thing to both tanks. I even use the same brand of filtration for both tanks. out of nowhere my 150gal just turned very murky and green while the 75 is still clear and looks normal. I have no idea what caused it nor how to go about fixing it. Like I said what I do to one I do to the other. When I do a water change I vacuum the gravel I also take about 25% of the water out. when its time to fill it back up I use a hose connected to the faucet and making sure its at the right temp and also use a water conditioner (not sure of brand). Im just confused as to why one tank is "perfect and happy" and the other is gloomy. I would greatly appreciate any help that I could get
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post #2 of 7 Old 05-29-2014, 05:37 PM
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google green water. its usally caused by
Suspended microscopic algae
Excess light, especially direct sunlight
Too many fish
Excess nutrients
Excess wastes
Green water is usually due to either a significant excess of light (particularly direct sunlight), or a major water quality problem. Although it may look terrible, it is not toxic to fish.
Water changes will reduce green water temporarily, but will not eliminate it. Completely blocking out all light for three days or more is very effective. The use of a diatomic filter will remove the suspended algae. If daphnia are available, they will quickly eat the microscopic algae, then in turn be eaten by the fish.
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post #3 of 7 Old 05-30-2014, 04:05 PM Thread Starter
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the tank is in the living room not near any windows so it really does not receive any direct sunlight whatsoever. the tank is 150g and I've only got 5 fish and a pleco in it. I've actually got more fish in the smaller tank than I do in the big one and they both have the same water source
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post #4 of 7 Old 05-30-2014, 05:33 PM
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Green water is also caused by fertilizers amount, light duration, filtration deficiency.
A total black out will clear in about 5 days. A diatom filter will take it in 2 hours. An UV sterilizer will prevent it from coming back.
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post #5 of 7 Old 05-30-2014, 06:10 PM Thread Starter
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To do a total blackout can the fish stay in there?
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post #6 of 7 Old 05-30-2014, 10:22 PM
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I don't see why not. Shipped fish spend more than 5 five days in bags, no food, no light. I'll be careful when you uncover them at the end, to prevent photo shock
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post #7 of 7 Old 06-05-2014, 03:54 PM
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How did it go?
I forgot to mention that a massive algae die-off will affect water quality. Increase aeration to provide oxygen to fish (and remove CO2) and do a water change to eliminate nitrogen waste.
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