Biowheels begin to get slower and slower as they "age" and more bacteria builds up on the wheel. It is not uncommon for them to completely stop. To help alleviate this when it begins to really slow and/or stop, take the wheel and rinse it in your *tank* water. This will help remove some of the bacteria/sludge and won't kill them in the process. Just remember, *never rinse* out the biowheel with chlorinated tap water.
I rinse my Emperor 280 biowheel once a month, just as a part of regular maintenance.
45 gal FW
1 Blue Ram - 2 Apistogramma panduro (pair) - 6 Bloodfins - 5 Blue Tetras - 2 Julii Corys - 1 Clown Loach - 3 Discus (Red & White, Leopard Snakeskin, Golden Leopard Snakeskin)
Emperor 280 & Fluval 204
90 gal FW
2 Apistogramma inca - 15 Rummynose Tetras - 2 Discus (Blue Turquoise) - 6 Paleatus Corys - 1 Clown Loach
Emperor 400 & Eheim 2028