Green water - The Planted Tank Forum
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post #1 of 25 (permalink) Old 10-03-2014, 11:51 PM Thread Starter
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Green water

Hi,

Another thing happen to me after an ammonia pike, some algae issue like diatom, filamentous and green spot on window...now i think i have green water.

A pic work for 1000 words, so what i need to do ? A UV light is the only think i need to buy ? What is the cause for green water ?

Thank

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post #2 of 25 (permalink) Old 10-04-2014, 12:03 AM
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Low CO2.
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post #3 of 25 (permalink) Old 10-04-2014, 12:39 AM Thread Starter
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Hi,

I'm at 4 bps and my drop checker indicate green with a 4dkh solution.
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post #4 of 25 (permalink) Old 10-04-2014, 01:34 AM
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Then you either have:
a) too much light
b) too little CO2

So either:
1) decrease light
2) increase CO2
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post #5 of 25 (permalink) Old 10-04-2014, 06:52 AM
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Never experienced green cloudy water but did experience the the white cloudy water which was caused by excessive trace ferts after a mistake on my part. I would let it run for 2-3 days and do a water change once it gets very cloudy.

Are you dosing ferts? If so how much and which ones?


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post #6 of 25 (permalink) Old 10-04-2014, 11:28 AM Thread Starter
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I fert with these bottle 1 pump by 10G and i have a 40G

My tank is not in front of Windows, but the room have much light.

My light is a Razor r420r at 26" i run at Max 95% and the photoperiod is 8 hours.
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post #7 of 25 (permalink) Old 10-04-2014, 06:15 PM
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Regardless, either:
1) decrease light
2) increase CO2
or
3) do both of the above.
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post #8 of 25 (permalink) Old 10-04-2014, 07:08 PM Thread Starter
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Maybe it is the ambiant light of sun? I have big Windows around in all place in my appartment ?

I will decrease the light because i have 45 fishs coming up next week! 15 ottocinxlus and 30 cardinalis.

I décreuse the period or the powerfull ?
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post #9 of 25 (permalink) Old 10-05-2014, 03:11 AM
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It's very obvious to me that you have way too much light and not enough CO2. You can easily increase CO2 and reduce light by either dimming it or lowering the intensity. Ambient light may be enough to grow your plants without even turning on the fixture. However, the fixture seems excessively powerful and not meant to be used for a planted tank at full intensity.
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post #10 of 25 (permalink) Old 10-05-2014, 06:32 PM
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+1 Solcielo lawrencia
Absolutely correct. Reduce your light immediately, and it as long as your CO2 indicator stays green-ish, up your CO2. That is the very best thing you can do to combat green water.
If you've got the extra money and want to use a UV sterilizer, they work extremely well too. Just make sure your flow rate through the sterilizer is within the recommended gph set by the manufacturer. Too slow and not enough of the water gets sterilized, too fast and the UV radiation doesn't do the job.
The best thing would be to fix the problem in the first place though. Less light and maybe more CO2.


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post #11 of 25 (permalink) Old 10-05-2014, 08:17 PM Thread Starter
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I bought something to put on front of windows to reduce ambiant light.

I also decrease the light by 1 hour (8 to 7) with same % intensity. Do need to decrease the intensity or only the time is good ?

I also increase the co2, i'm now at 6-7 bps. The drop checker still green.

Also, i bought a hydor powerhead to get more flow.

I have 3 amano shrimp in these, i will check them if all is good.
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post #12 of 25 (permalink) Old 10-05-2014, 08:24 PM
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I agree with the two previous posts, but there is more that you can do to help. Just for the sake of clarity, I'll lay it all out:

  • Decrease your light intensity rather than duration. I was lucky enough to have a less intense light available when this cropped up for me. If you aren't as lucky, you can wrap the light with gauze.
  • Put your lights on an on / off cycle with a timer to help manage your CO2 levels. My lights are on a 5 on, 4 off, 5 on cycle
  • Block any natural lighting from getting into the tank for the time being.
  • Add carbon filtration to your filter and keep it fresh. Will aid in removing some Fe and DOC from the water. I went an extra step and hung an extra bag in the tank.
  • Add floating plants or other fast growers. I used both Frogbit and Duckweed floating which ended up being sufficient. With any planted fast growers, let them grow emergent. They become far more efficient at processing nutrients when they draw some CO2 from the atmosphere.
The ultimate goal is to give your plants the advantage over the algae in absorbing nutrients. I have found these steps above to be very effective.


Best wishes.
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post #13 of 25 (permalink) Old 10-06-2014, 08:46 PM Thread Starter
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Twinstar S can it remove to green water ?
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post #14 of 25 (permalink) Old 10-06-2014, 10:46 PM
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How long has the tank been established? Im asking because you may providing to much nutrients and the plants may not be taking enough .There needs to be a balance.
Tank black out for a few days a towel works and then a good water change followed by a uv light,i like to leave mine on 24 7 for a few reasons.


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post #15 of 25 (permalink) Old 10-07-2014, 10:46 AM Thread Starter
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I started the tank 6 weeks ago.

I dont have uv light at home, black will not Die the plant?
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