The tube does a great job cleaning the surface. Good quality. But for some reason my amano shrimp (small, no bigger than adult cherry shrimp) like to climb into the cooking tube from the top. Every morning I had to rescue a few of them from my filter for the first few days (luckily I have a pre-filter that will catch them safe and sound). I then had to stick a piece of styrofoam into the main pipe just below the movable top. I still see a shrimp or two sitting on the foam every other day, but at least I don't have to open the filter to release the shrimp. Interestingly, I've never seen cherry or crystal shrimp go through the pipe. I think they are not that active. I wish the skimmer had extra white/clear foam or mesh to keep curious shrimp out. This is the only reason I gave it 4 starts instead of 5.
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