If you really want an algae-eating shrimp, maybe try a full-sized Amano (especially a big female) -- I think it would be big enough to not be eaten. When a friend of mine went to Discus & German Blue Rams, he bought about a dozen ghost shrimp and put them in the tank, thinking they would be a nice treat for the fish. Six of the smaller ones were eaten, but about half of them either were big enough or smart enough to avoid being eaten. Now, they are large enough that they roam around the tank stress-free. I was surprised at how nice full-grown ghost shrimp look, and they are excellent detritus eaters. They will swallow an entire blood worm, if given the chance!