Freshwater invertebrates like shrimps, crabs, and mussels are perfect for nano tanks, offering a unique and dynamic addition to these small aquariums. Nano tanks, typically under 20 gallons, are ideal for species such as Cherry and Amano shrimp, which thrive in compact environments with plenty of plants and hiding spots. Their communication styles are spectacular too. For example, some shrimp, like the Amano shrimp, are known to “dance” in groups when they find a food source, signaling to others that it’s time to eat. Similarly, certain crabs, such as the Fiddler Crab, use their oversized claw to communicate and establish territory, while freshwater mussels have evolved to mimic small fish or insects to attract host fish for their larvae, showcasing their incredible adaptability and survival strategies in the wild.