I have a 54 gal. corner tank with a 15gal sump. I also have 10 billion microbubbles at any given time. I have a 2 in. drain, with a 1.5 in. return on a mag 9.5 pump. So about 750 gal an hour going through. I also have a euro reef protein skimmer, 3 baffles. I tried putting a bunch of spnges in the sump to take out the micro bubbles, and it helps... For the first 15 min. few bubbles, then after that it gets horrible again. Without any spongs or anything visibility in the tank is absolutely horrible. I also tried putting silicone around the joints on the return, I'm pretty sure I got all of it, but its hard to reach and I can't see all around every joint, but Im pretty sure those are completely sealed. Anybody have a good way to get rid of them that I haven't tried yet? tia