I have a GENX 4 on a 100gl tank and I keep getting mirco bubbles coming out of the return and my tank looks like there is floating food in it all the time any help
Most likely air is being drawn into the return stream via leaky holes in piping.
Try apply plumber's tape over each and every connection whether it's threaded or slip. After each time you taped up a joint, look into the tank and see if bubbles disappears. Do this and hopefully you will find out which joint is the culprit.
