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my tank : 36"x18x18 for aqua-grass planting
external water filter : 680L/hour
Sometimes I found that though my filter is not very powerful, the water flow of the outpet is already very high....... and I fear that it may cause harm to the plant...... so I add a 雨淋器
If I use a more power filter e.g. 1200 L/hour, how to control the water flow (that cause no pressure to the plant) at output but keeping the high water circulation rate??? I found it is quite difficult to control..... how to solve it ??
....thanks
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