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The fishies are part of the reason your tank smells bad,and so is the ph.you have to make sure that everything is correct.i recommend checking atleast weekly.another reason could be algae and moss but the main answer you can get is because its supposed to!

If it isn't any of that it is the ammonia(fish pee). If you don't have good water than the ammonia builds up. To stop this just get a good filter and never use tap water without declination drops.

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10y ago

What else can I help you with?