I am currently having some trouble with my sump which is causing microbubbles in my aquarium and loud noises in my room...they are coming from the return pump and I think the skimmer has something to do with it. the skimmer is a reef octopus. in the manual it says that the return needs to be above the water line which is causing a lot of noise. does anyone know if it is ok to make the water line halfway up the return or somewhere near there? Also