^ I honestly don't think thats the case, more likely the fad just died over here...
Also, a lot of stores have closed down on fish street, and the ones that have survived are starting to become more specialized in what they sell i.e. a lot of stores on ground level are mainly for hardware (tanks, filters etc), or deal with your more common fish and plants, while if you are looking for rarer stuff, you tend to have a check out the up-stairs shops...
Either way though, it seems now that with less stores around, the shops are really stepping up their game in keeping their fish healthier, the tanks filtered properly and clean... even a lot of the rays i have seen for sale lately have been much fatter and without the red under-belly common with ammonia burn i used to see in a lot of the other stores... although naturally the prices have also seem to have gone up probably due to the better conditions...