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surface scum question

Hi everybody have a question about this 'white surface scum' on the surface 
of my tanks

is it really necessary to get rid of it? what i mean is does it do any harm 
to the plants or fish in my tanks? i have some fish breeding in my tanks 
with teh surface scum and they seem to be very happy
although i do feed frozen blood worms/brine shrimp i think that causes to 
the white layer..
or is it just a matter of appearence?

thanks guys

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