I had a bunch of hitchhiker limpets. Yes they do great with algae, they are not fast so don't expect impressive results. However, their main food source is coraline, so their tongues are like little grinders, they're great until the decide your sps needs a cleaning..... Also they have adapted to live on tidal zones with strong wave action (hence their body shape) so when it comes to removing one, you better have a razor blade or a 4ft pry bar. My Mexican turbos are great. I can not speak enough about nassarius snails. Not just at night, but any left over food, they take care of in a hurry, anything that dies they are on top of it in 5 min (no exaggeration) I had mine completely dissolve a mature bengai cardinal in 20 min. These guys are insane eaters, but don't do anything for algae