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evapouration
It will cool down water temperature when by melting down AND it will lift up the water level in the aquarium
Evaporation.
The fish are drinking it. Get rid of the fish
You need to get a water pump and filter for the aquarium at a pet store.
Because the fish need the enough amount of water every day of their lives
Do water changes, and use aquarium salt at around 1tsp per gallon
Put a cup of water in a windowsill for a few days. Everyday mark with a marker how much the water level has gone down. When it goes down, that means the water has evaporated.
There should be a line indicating how far they go down in the water
You can do a water change while it is cycling, but that might slow down the process.
As far as the running of the tank and the efficiency of the filter is concerned, it doesn't matter if the water splashes down into the tank or flows quietly into it provided you are getting a maximum flow and the filter is cycled.
the water level would sink. Anything that sinks into the water would cause the water level to sink