Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Very good comprehensive introduction to freshwater fishes

Although it's been around for about thirty years, it has been revised and updated. This is an excellent guide for getting a grasp on what those little fish are in the pet shop tank, what they need to eat, what they need in terms of water temperature, pH, hardness and quality, how much space they need, how well they get along with others, and how big they grow. (That cute little fish with "C. managuense" on the front of his tank will get along just *fine* in the 10-gallon tank with your fancy guppies! [NOT!]) There is even rudimentary breeding information for a great many species.Even for advanced aquarists, there is a ton of useful information here, even though much of it is dated. The looseleaf edition allows for updates.The only reason this gets 4 stars instead of 5 is that it is somewhat dated. It's still one of the better all-around fish books you can get.