Ideal for small ponds, this aeration system very easily converts from any 4 styles to your sub-area circulator in only minutes. Nitrates are By natural means eradicated by plant absorption, in addition to by microbes living in gravel which convert nitrates into nitrogen gas which then evaporates through the tank. https://pearlaquatics.my/4-things-you-can-get-from-a-renowned-aquarium-shop-kuala-lumpur/