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bacterial colony or algae?

Yes, but mostly due to too much light and immature sediment. Do a blackout, improve CO2/flow/distribution and it will go away all by itself.

Cheers,
 
Can I get rid brown algae without removing them? I can't take off all them because they are growning in whole tank and on the plants.Currently there are two 30 w T8 tubes over my 300 L tank (60 w total). They're about 7 cm from water suface and now both of them are covered by printer paper. If I keep doing 50 % water chances twice a week theses algae will disappear by themselves?
 
You can do a 3-4 day blackout and that will put a serious dent in them but you must improve CO2, flow and distribution so that they do not return.

Cheers,
 
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