I have a 35 gallon oval tank with fill from pump at the bottom pushing water flow straight in and Drain is off the top on the long side. I always run pump full open and off the top of my head it is a rule 500gph and fills in roughly 7 minutes like many mentioned.. But at the end of the day 6-8 hours of fishing I dump maybe 1/3 of the fish out that are dead. Almost always get bait from Nachos in LBC, but was wondering if I have too much flow or not enough. Do I need to direct the water flow side ways so I can get the bait to try and swim in a circle? Or is that amount of die off normal? Any help is greatly appreciated.