I regret the few species raised for crayfish (2 only). The nano is the world of shrimps and crayfish in volumes of less than 30 liters, only they will settle.
Other snags: no advice on cohabitation between shrimp and fish, for example, some species being carnivorous trend, and nothing on the Betta splendens which largely its place in the nano aquarium, alone of course.
If this book is very well done with simple terms and a glossary for more complicated terms.
Book to recommend.