John's assessment is a very accurate of the reality of how (if you buy an oscar raised in Ohio) it doesn't mean that oscar is adapted to your water in Phoenix, or even Chicago.
Or if you buy a Geophagus that is temporarily held in 7.8 hard water, that doesn't mean that what is needs.
Researching the water conditions if wild or only a few steps from the wild are very important.
Many species imported from the black water rivers like the Rio Negro, and have evolved to live in pH 4, soft water, and will not easily adapt to even pH as low as 7.2.
And breeders often cater to the water to a tee, the pH, mineral content and other factors to where species come from, and not buck what particulars certain species need.
Or if you buy a Geophagus that is temporarily held in 7.8 hard water, that doesn't mean that what is needs.
Researching the water conditions if wild or only a few steps from the wild are very important.
Many species imported from the black water rivers like the Rio Negro, and have evolved to live in pH 4, soft water, and will not easily adapt to even pH as low as 7.2.
And breeders often cater to the water to a tee, the pH, mineral content and other factors to where species come from, and not buck what particulars certain species need.