Ecology of the Planted Aquarium
Who it is for
Anyone who wants to know why a planted tank works, not just how to set one up. Walstad is a microbiologist. She treats the aquarium as a small ecosystem and cites the primary literature on every page. The reference list at the back is itself a reading list, and a very good one.
What it gets wrong or leaves out
It is a scientific argument, not a manual, with almost no pictures. The low tech soil method works, but the book undersells how badly it can go in the first two months: a new soil tank leaks ammonia and often grows a lot of algae before it settles, so give your planting time to settle in. And it is a plant and chemistry book. Fish appear mainly as a source of nutrients and as a thing that can be poisoned.
A correction you will need
Many websites, shop listings and machine written articles claim a 2025 or 2026 edition. There is no such edition. The fourth edition is April 2023, confirmed on the author's own site.3 Walstad did publish a separate and different book, Aquarium Fish Reproduction, in 2025, and that is probably where the confusion started. If a source cites a 2025 edition of this book, that source did not check. Earlier editions exist from 1999 with several ISBNs attached to the same catalog cluster, and the catalog does not say cleanly which belongs to which, so none is printed here.

