hi everyone, im literally about to go to the LFS and thinking of getting a cleaner shrimp, but what do they actually do? it would be a good addition to my CUC as i know you need a variety but will it eat algae or just clean everything from parasites? thanks everyone. also want something to help with the sand bed, my LFS doesnt have any type of snails for this but do sell gobbys, which would be best for this? as i can go have a browse today and come back another time..? cheers!