nomicon;2804083; said:300 Gallon Tank w 60 Gallon sump and six foot bio-tower. I'm running an Iwaki MD-70RT, 1100 GPH.

thx man you just answered my question,packer43064;2807213; said:515 GPH pump on a 10 gallon sump used for a 55 tank.
wizardslovak;2813607; said:thx man you just answered my question,
i got 55gall with 10gallon free tank which i am planing to convert into sump but never knew which flow rate to use !
bt what pipe sizes are you running