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anerobic substrate

from what i've read i assume that the gas bubbles.. etc etc.. are a bad 
sign.. what's the cause of this problem? from the substrate being too thick 
say over 4 inches?.. the concern is my substrate at the rear of my tank is 
about 6 " and around 3 inches in th front and i have a 1/2 inch of peat in 
my gravel..should i be of concern? (or maybe i should read more before 
posting) anyways does having fish say khuli loaches help? with circulating 
some water into the substrate?

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