Personally I would yes because the profiles at loaches.com are compiled from many peoples actual experiences and knowledge and so far they have been right on with information pertaining to the eight species of loaches I keep.
There are going to be anomalies in any fish size, somewhere there is going to be one larger or smaller than average. I don't know which book your referencing or anything about the author, but no matter what you read your going to get a general size and please understand I'm not slamming the information in your book just saying from my own experiences the profiles at www.loaches.com have the most correct information I have found.
ps in Novemver there is going to be a new Loach book available called
Natural History and Aquarium Care
It will have 150 colored pictures.
I can hardly wait
Don't know,The publisher will set the price. The only reason I knew about it was because one of the contributors to the book gave us a heads up on it at one of the other sites I go to. We've been waiting on it for several years.
And when you need the info most is when you're are at the pet store and can't access loaches.com. This wayyou could carry the book in your car with you when you go to the store and if need be, just run out to your car and check.