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Hi i would like to know what the oily surface on my 55g is and if it is harmful? I think it might be from the pellets i feed my SA cichlids because they let some food particales come out of their mouth when they are eating them but i am not sure???
 

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protein film.and air stone leaved on for a few hours will fix it
 
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Hey, Kitten, is there any other option to deal with this since airstones and planted tanks aren't friends? Or does it not take long enough to really effect a planted tank? Just wondering. I keep having this problem myself.
 

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thats easy.. remember the rule??? plants give out o2 in the morning and takes in co2 but at night it's the other way around.so a few hours of extra o2 to mess up the protein film at night is totally ok.
 
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