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thanks i have got good circulation around the tank when i point it towards the middle pointing up a bit the trouble is the plants are all leaning forward because of the flow i have got a trigon 190 tank so there is not alot i can do either straight down or towards the middle.The best position is always determined by experimenting n the tank. You want to get good circulation through the whole tank so you try things that look like they will work for the size and shape of the tank and the type of return nozzle that you are working with. As long as you don't end up with lots of dead spots in the tank and totally still surface water, you have found a good position.