I have a typical HOB filter, 2 filter spaces, NO biowheel, just your typical filter on my 46 gallon. IT's been running for close to 7 months now. Lately it has been very noisy. I've taken it apart and cleaned it and it's still noisy. Is this typical? does it mean its time to replace the filter? what is the life span of these filters? It still seems to work fine; it's just really annoying to listen to.
Thanks
Thanks