when looking at my tank the only difference i've had in that tank and other tanks is plants. my wood is the same same wood i'ved used before and the dirt shouldn't be a problem. heater is the same no rocks no special air stones. um....my filter has like ceramic rings in there but i dunt think that could be the problem. i do have 1 small pleco cave in there. it's made from slates used for discus breeding. it's relatively small so i dont' think it can do huge changes in my pH
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