The Nano Baby Protect is a simple attachment for the corresponding filters from Dennerle, which closes the filter slots and prevents in this way that young Formatted swim in the filter and die there, if necessary. Although the additional price initially seems high, the purchase is worth in terms of significantly increased survival of offspring, especially in small aquariums. Only the question remains why a corresponding device is not appropriate from the outset on the filter. For shrimp fans and hobbyists a strong buy recommendation!