In my iqube 3 (8 liters Mini Aquarium of Superfish with a few water snails) the filter has recently failed. Unfortunately, I did not and could not let the bill so the thing repaired and a replacement I have not found ... I have then bought the Nano corner filter from Dennerle and actually made me no great hopes, but: the filters can be completely obstruct rear right in the small chamber and the pipe even so align it flows through the original Ausströmungsröhren! The tube at the filter was only 2mm too long and had to be filed down, now it sits perfectly in the niche and makes neat movement in the water! And the great thing about it: The filter is much quieter than the original built-up filter! The basin is in our living room, the filter runs continuously and actually you can hear not him. On delivery, there was even a new replacement filter element with this! I would recommend this product only, the price-performance ratio is right here actually.