You should have had an air pump with the hose leading to some sort of porous stone like aquariums have. I had this problem. Your fish were trying to get an oxygen, desperately coming to where the water was dropping. Because that's where they could get some oxygen from water mixing with air. Install some air pumps with tons of bubbles and some filtering system. You don't need to have constant influx of new water. And do some mathematics. How many fish per cubic metre of water and how much nitrogen they can handle from the food and their own poop and then try again. It will be better this time.
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