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post #1 of 12 (permalink) Old 11-02-2006, 11:21 AM Thread Starter
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Green thing

Hi all I have some newbie questions here and need your advice.

I have a 4ft planted tank with pressurised CO2 and eheim cannister.

I have this green film thingy on the surface of the water. But the water below it (inside the tank) is crystal clear.

My questions:

1. Is this green thingy harmful ? Does it do anything bad to the water, plants or fish ?

2. What did I do wrong that cause this ?

3. How to encounter this problem ? Short term, long term and hopefully forever ?

Thanks in advance.
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post #2 of 12 (permalink) Old 11-02-2006, 11:45 AM
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Sounds like typical surface scum. I believe it's typically caused by lots of dissolved organics in the water.

Many times, lots of surface movement will break it up. My tank has it, but it doesn't really bother me too much

I suppose a surface skimmer would really do the trick, too!
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post #3 of 12 (permalink) Old 11-02-2006, 12:18 PM Thread Starter
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So it doesnt do any harm ?

If I use surface skimmer, would that stip huge amount of CO2 from the water ?

Is there any water parameters that I could do to fix this problem ?

Thanks
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post #4 of 12 (permalink) Old 11-02-2006, 02:35 PM
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I would create gentle movement on the surface of the water to see if that helps. You may need to up your C02 slightly to accommodate the extra oxygen that will be in the water.

In my opinion it is harmful in the fact that you will not be able to get as much light to your plants.
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post #5 of 12 (permalink) Old 11-02-2006, 04:35 PM
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Yea, a surface skimmer would definitely degass a lot of CO2. So will surface movement, but not nearly as much. Like Widefx says, you may need to up the CO2 to keep the same concentration.

One thing.....my surface scum is not really green. More like an oily film. Could you go into further detail about what ti looks like, it might be something different.

I would guess that much of the surface skum produced is due to heavy bioloads and lots of fish foods. Maybe lower the population in teh tank, or just the feeding schudule.
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post #6 of 12 (permalink) Old 11-02-2006, 04:42 PM
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we just discussed this type of scum recently, lots of good info here;
https://www.plantedtank.net/forums/ge...2-survey.html?


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post #7 of 12 (permalink) Old 11-03-2006, 08:18 AM Thread Starter
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Originally Posted by esarkipato View Post
One thing.....my surface scum is not really green. More like an oily film. Could you go into further detail about what ti looks like, it might be something different.

I would guess that much of the surface skum produced is due to heavy bioloads and lots of fish foods. Maybe lower the population in teh tank, or just the feeding schudule.
No its not clear film, its green film, like you can actually see the green covering the surface.

As of population, its a 240L tank with not many fish in it, so I guess it would be fine. Feeding would be once a day.

Thanks for the link, I will have a look and ask further questions if I still confused.
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post #8 of 12 (permalink) Old 11-03-2006, 08:20 AM Thread Starter
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I will try to increase my CO2 for the time being, perhaps to 2 bubble per sec ? Now running at 1 bubble per sec....

Should I do something about the water chemistry ? Increase nitrogen or reduce something ?? Anything ?

Thanks
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post #9 of 12 (permalink) Old 11-03-2006, 09:35 AM
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IMO,You should do a thing at a time so you can work out were, if anything went wrong.

You can always add but never take.

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post #10 of 12 (permalink) Old 11-03-2006, 01:27 PM
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Originally Posted by DR.V View Post
I will try to increase my CO2 for the time being, perhaps to 2 bubble per sec ? Now running at 1 bubble per sec....

Should I do something about the water chemistry ? Increase nitrogen or reduce something ?? Anything ?

Thanks
Increasing the C02 was only suggested if you add some surface aggetation (sp?)
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post #11 of 12 (permalink) Old 11-03-2006, 01:35 PM
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No its not clear film, its green film, like you can actually see the green covering the surface.
Sounds like some BGA. Easy enough. Just agitate the water's surface a little bit. That should take care of it. The amount of CO2 out gassing will be negligible. A little surface movement isn't too bad a thing.

As I see it, that should abate the problem. No real need to increase CO2 or change fertilization your fertilization scheme.

Mike
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post #12 of 12 (permalink) Old 11-04-2006, 06:59 AM Thread Starter
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Thank you all, and will try to create a bit of surface movement for now.

Thanks for all the inputs.
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