I have a biocube 32 with seahorses coming tomorrow morning. Of course, while getting the tank ready my pump stopped working and I realized the impeller broke the shaft in the middle snapped. It makes a horrible squeaking noise but still works so the seahorses still have a tank, however, I absolutely need a replacement impeller because of the noise. The piece I'm looking for is a corallife S-1000 impeller or one on amazon that I can get quickly and will fit but Ive been unsuccessful in my looking if anyone can help