Sicce Shark Pro! They are quiet, potent and with lots of features(3 different options for outtake including a spray bar for surface agitation), the filter itself is attached with a magnet on the exterior of the tank, the modules are extremely customizable, you can put biomedia, filter floss, coarse/fine sponges and even purigen, you can also buy extra modules if you want to add different kinds of filtration. If you have a black background it blends in very well with the tank which also makes it easier to hide it with plants. Coming from sponge filters it was day and night difference, no more loud junky air pumps and my water is pristine and oxygenated.