That impeller looks melted along the crack.A good thought but there's little to nothing in the return. I don't keep a very deep sand bed, what I have is more coarse and doesn't tend to get stirred up. When I do my water changes every 2 weeks I have a 1/4" siphon I use to clean between the baffles, in the corners and all around the pumps. There's just goo around the magnet when I take the pump apart. Both of them cracked the same way. I don't run them high, usually at 1.4.![]()
