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It's just that the sewer crawls out, don't care if it flushes directly down the toilet or throws it away and dries it.
No harm! Connect all the electrical parts of the toilet and the metal of the faucet to the PEN wire with a wire to prevent electric shock.
This bug is called a gnat, buy a bottle of insecticide and spray it.
I heard that lighting candles in the bathroom often is a good way to get rid of the smell (the smell gas burns off). You can give it a try.
Ventilation can properly eliminate some odors. But it consumes energy, there is noise. >>>More
The best way to get rid of the fishy smell is to rinse it with clean water, and you can also use a toilet cleaner. When not in use, keep it ventilated. This way the toilet will not smell fishy. Thank you!