90 gal tank

[jonny1234]

i have a 90 gal salt tank useing for fresh water has the over flow built in left hand conner 2 tubes drilled in the bottom one has a spunge filter with a tube gos up and down with water level outher return

my ? i have a 20 gal sump the pump that came with it is on its way out need to replace it no label on it no idea what size to get any help be good how many gal pump do i need

 

[jonny1234]

thinking 500 600 gph be good or should i go more or less ?

 

[sizors]

make sure you read the label for gph at 3 to 4 feet