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Green thing on water surface

1K views 2 replies 2 participants last post by  DR.V 
#1 ·
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.
 
#2 ·
can you post a pic of it
 
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