Have your aquarium filter stopped producing air bubbles in it's flow. On observation you found that water flow is ok but, bubbles are missing. Now you neither know about the reason for that nor the solution. Watch this video till end you will be able to do so very easily.
Watch video #189 online without registration, duration hours minute second in high quality. This video was added by user Aqua Tech Info 11 February 2020, don't forget to share it with your friends and acquaintances, it has been viewed on our site 85,92 once and liked it 1.7 thousand people.