I have a Penguin Biowheel 150. 9 months in and it has stopped spinning! Cleaned out the pump, impeller, wheel slots etc and it still wont spin. Is this a big deal? I know the biowheel holds the bacteria but I also have an intake sponge on the filter, sponge material in the filter and a medium hikari sponge filter in the tank. Fine to just keep it as is without the wheel spinning? I think i have plenty of bacteria holding spots with the sponges Thanks!