i have the 65 galon version. i found the best thing to do to the bubble difuser is
a: take off the hose that goes from the skimmer to the difuser. it is that kinky, plastic hose. you can jsut pull it right out.
B: and then have the bubble diffuser sticking a bit above the water, with the top foam piece coming up to cover the water coming out. this will reduce micro bubbles, let you adjsut the skimmer easier, and pulling it up will also help reduce sound of the splashing.