The water in the fish tank turns green and the fish are dead. Why (the bathtub is on the platform with sunlight)?

First, now that the weather is hot, the oxygen content in the water will decrease rapidly, and fish also need to breathe.

Secondly, fish leave a lot of excrement when they live in the fish tank. If you don’t clean it up for a long time, many parasites will appear, and the water quality will gradually deteriorate. This is why the water turns green. reason.

So, it is recommended that you change the water regularly