bblboy54 - Amano and Cherry Red shrimp eat algaes that snails and catfish ordinarily cannot eat - filamentous algaes such as hair algae - along with the soft green types that snails and suckermouth cats prefer. So they are in fact broader spectrum in their taste and control. Plus they can work surfaces that cats and snails can't or don't - fine-leafed or threaded plants (Marimo balls, Java Moss, needle-leafed stems, etc.). For glass, small suckermouths are better.