The bio balls should be above the water level so the water can evenly disperse/trickle through the bio media. your water level should be just above your water pump and just below the bio balls.....(also to avoid water overflowing from your sump) your bio balls is your bio media....a filter block sponge can be added to eliminate micro bubles from entering your pump. and your filter pad should sit above your bio balls.....Wetdry filters are more frequently used in Salt water set ups.....
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