Hi Fai,
Fluval filter is a really good choice. Cheaper than Eheim a far many street but the filtration rate is very accurate to their specification as I tested practically. If buy Fluval, I recommend you go to "Cheung Lung" becaue they are selling the 2nd version of "04" series. The main difference is introducing a stop lever at the "Aquastop" rather than the 1st type use spring to stop the water. This can ensure the whole flow channels (in & out) within the "Aquastop" would never block by leaves...
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