u/Blazahhhhh

Hey all, i have a inline diffuser and lily pipes for my 30L tank and I'm not sure the best placement or angle for the outflow for optimal circulation and dispersion.

I don't know if I'm better off aiming the outflow at 1 or 2 for the best circulation, i have tried putting some crushed up fish food in to try and watch the flow but they seem almost the same?

Any help would be great, also unsure of optimal location for drop checker.

Thanks all!