Plagued by green water...

[Mudfrog]

Ok guys.. I have a 125g tank that I'm having issues with green water.. I have a 9w UV sterilizer (just changed the bulb), I know 9w is not enough for a 125g but it has to help some. I also have a lot of duckweed and frogbit as well as some of the bulbs you buy from walmart. I checked my water Saturday prior to doing a water change and my nitrates were under 5. I'm baffled.. what could be causing the green water? I do keep the lights on for 8-10 hours a day but with nitrates under 5 shouldn't the green water be starved and go away?

 

[Countryboy]

Have you checked the ammonia?


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[F1 VET]

Is green the color of food you feed them?



Go S. Vettel #1 rb8

 

[Mudfrog]

Have you checked the ammonia?


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Ammonia and Nitrites were 0. Didn't know Ammonia would cause an algae bloom.

Is green the color of food you feed them?



Go S. Vettel #1 rb8

Nope.

 

[fishman61]

Any direct sunlight on the tank? I only have my lights on my tanks less than 4 hours per day, 125 & 150

 

[Mudfrog]

Very little... I do keep the lights on for 8-10 hours a day but I have read that is what it needs to be on planted tanks.

I just tested the water again. Ammonia 0, Nitrite 0, Nitrate 5

 

[fishman61]

How often do you do water changes and what percentage? I do weekly 50%

 

[mikerider]

My 100 gallon tank had the same problem before but not until i changed my filter from 2 power filter to just 1 canister filter (Fluval 404).
before picture:


After Picture:

 

[Mudfrog]

WC's are 50% once a week.

The green water is nothing like that, just to the point that it has an annoying green tint when you look in the water.

 

[F1 VET]

Most aquarium glass are tinted green..? maybe free floating algae in the column..? Does it decease after a LG wc?

Go S. Vettel #1 rb8