One won't be enough? here is the info:
Turbelle® stream 6060
(6060.000)
for aquariums of 250 - 800 l (66 - 211.3USgal.)
Output: 6000l/h, (1,585USgal./h)
Pump wattage: 11W
Voltage / Frequency: 230V/50Hz
Cable length: 2m; (78.7in.)
Dimensions: ø98 x 118mm; (diam. 3.9 x 4.6in.)
Outlet diam.: ø50 /...