This could go back an forth all day but I will say that your dismissal of my last source seems flippant. They are studying the behavior of the fish, putting them in an environment that would unduly stress them would defeat the purpose of the experiment.
By saying that "I'm not sure animal testing labs have the best track record when it comes to animal welfare" your completely avoiding the point with an inflammatory statement. I did not site an animal testing lab at all, rather a scientific study done by a major educational institution.
Finally the assumption that that these are "bad practices" simply because they deviate from your own shows a clear bias.