Most people are familiar with red cherry shrimp (neocaridina heteropoda var red) but they are a great little shrimp despite their commonality: Neocaridina heteropoda var yellow: neocaridina zhiajensis blue (blue pearl): neocaridina zhiajensis white (snowball shrimp): Caridina babaulti green caridina babaulti cf stripes (dwarf zebra) Amano shrimp (low order so doesn't breed in fw but AMAZING algae eater) malawa shrimp bumble bee shrimp I like to keep my shrimp with microfish and other invertebrates. Some examples are pomacea diffusa ("mystery" apple snail) which do well as long as the shrimp are not too numerous. boraras brigittae (stay under 1") dario dario nerite snails microcrabs dwarf cories different ancistrus and many small tetras and rasboras erythromicrons galaxy rasboras These are just a few examples. There is a lot more versatility out there for small tanks than ever before. The lists of microfishes and invertebrates becoming available for import is staggering. The majority of these species can be kept in a small desktop aquarium.