I currently have a 20g long tank with 3 angels, 2 gouramis and 3 corycats. I want to add some algae eaters and was looking at the amano shrimp as a possibility. I read their profile in the other section and I'm not sure if they would be suitable for my tank. As my angels get bigger, are they going to try to eat the shrimp? I have one of those glass covers on top with a gap in the back for the filter, does this mean they are going to escape? I also read something about how they might get into the filter. I have a HOB penguin filter, is this going to be a problem? Any other information about these guys would be helpful, and maybe suggestions for other algae eaters I can get. I'm looking for something smaller that will stay small, and something cute. Thanks guys!