It's hard to say, it depends on the type of fish you raise or the type of ecological cycle you engage in.
It is best to use natural circulation for natural purification. Recently, the price of solar cells has fallen significantly. You can consider solar power generation to boost water circulation in fish ponds and self-filtration of water circulation. purification systems. You can view related information online. Taobao also sells many related equipment.
It is best to consider your own environment, assess the situation and use local conditions.
There is a saying that a certain place and a certain pond are naturally suitable for it. He is destined to do so. Your key is to discover this key.