Hi there,
using this calculator http://www.reefcentral.com/calc/drain.php I worked out that my overflow should be 12.7 cm however I do not believe this will be big enough to hold both a durso stand pipe and a spare overflow. Does it matter if the linear length of the overflow is bigger? while keeping my return pump the same size? This is based on a 3x tank cycle of 432 liters per hour
Regards Darren
