I have a 120 gallon tank with 2 inlets and 2 outlets. There are absolutely NO MICROBUBBLES in the return chamber of my sump/refugium yet they are in my display tank. 1 return pump is a mag 9.5 and the other return pump is a mag 7. whats the way people find out how the air is getting inside? Is it those split forks on the return with all those knuckle joints? They arent and can not be fully submerged they way the tank is designed. Do they get replaced as general maintenance?



