it comes this plastic tube (it isn't in the pic) but i have no idea where it goes or what is it for?
Ah, a simple filter (I'd really apprieciate some information on the build quality and noise level of that. Intake is trough the slots at the bottom. Top left shows the outflow pipe, that makes a 90 degree angle up and then another 90 degree angle. The clear plastic tube has holes in it so that the returning water is distributed evenly and results in a bit more air in the water.
Its a spraybar oxygenates the water it goes on the part the water comes out from
Does the tube you're referring to have a little hole in it? If so it's for hooking up an airline to help oxygenate the water.
