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Look on the top of your eheim, it should say the lph, you want the inlet below the outlet so the water is pushed outof the outlet along the top, down the end of the tank along the bottom back towards the inlet so it creates a flow all round the tank, if your getting a powerhead then stick it the opposite end of the tank from the filter facing slightly downwards so it blows back towards the inlet helping he flow circulate the tank. Look on your filter and calculate how much extra flow you need.
Flow looks ok on that, I'd give it a small nano powerhead to be safe and leave it at that.