Although I've kept salt fish for 40 years I'm new to reefing. My 90 gal tank started leaking so I opted for a larger 150 gal tank and decided to make the new tank reef. My old tank had been setup and running for 22 years and I had never cleaned out the sump. When I shut down the old tank I found 1-3/4" of detritus and other crud in the sump bottom. I vowed then to do better with a reef setup. I bought Eheim's Quick Vac Pro to vacuum out the sump every quarter or so. My new tank isn't quite running yet so I can't report on the Quick Vac Pro's effectiveness, but it looks like it'll do a nice job. I'll report when I've used it a time or two.