It's rated as 2500L/h pump..good for 2ft tank liao..!
Btw, How big is your tank? If smaller than 2ft, then no point wasting $$$ to get Red Dragon, ehiem, Rio, H2Ocean pump should be sufficient.
Beside artificial mode, Natural can also create cloud and thunder too with later firmware from ver 5 or 6 onward!
Fyi, I have been using natural mode with cloud n thunder since March but my wife doesn't like it so I switch off...sigh...