I have one in my AP 24. It does pull pretty nice with the cup raised about 3/4 of the way up, but it's not a "sludge", but a dark brown "wet" skim-mate. It is, though, a small cup so I empty it every 2 days. I still get a few micro bubbles in the display, but as I'm feeding a disappearing wrasse, pygmy angel, and a neon goby (small, but eats like a pig), I tolerate the trade off on the bubbles. I did get it at the original price, but now that it's up to $140.00 I might look at alternatives, unless you're committed to the hood. If you're running topless, you have a lot of options at the same price point.
Henry
Henry