While not particularly helpful if you want detailed species profiles it makes up for it by providing good in-depth information on other things, like what type of lighting would work best with your plants.

For the price and length of the book I was surprised at the quality. I generally pay $12 for a 60 page pet book. Well worth the $11.

The measurements are in Metric, which some people would find as a turn-off, however it does give a conversion guide near the back of the book.

Quite honestly the best pet book I've laid my hands on yet.

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A severe lack of trichogaster.

Just because your Gourami is sick does not mean it is always Iridovirus, DGIV, Gourami Disease, et cetera.
Look at all the other factors in your tank before coming to this conclusion.