Observing some dead spots in the tank I'm looking at ways of improving the flow. The tank is 48 x 20 x 15 (inches) 250 ltr, CO2 injection, filtration is via an EHEIM 2026 Pro II. Spray bar is one the side with the holes pointing down at about 10 degress off the horizontal with the inlet pipe at the opposite end of the tank. The filter is running at about 90%. I note in the latest edition of PFK (Back to Basics article) George recommends both inlet and outlet at the same corner of the tank to promote all-round circulation. Does this apply only to small tanks or would it work on larger ones? The only way to find out I suppose is to try but grateful for any advice.