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Perhaps a campaign is in order to have aquarium stores display information or even hand it out with purchases regarding the dangers of introducing exotic species into our waters.
Even more disturbing than exotics getting released, are the amount captured and dying in transport, die in shop, or shortly after the sale due to stress or disease. Most of the places where these exotics come from are very poor countries where there are no regulations or safe capturing practices in place. The reefs are dynamited, and/or chemicals used to capture specimens resulting in total devastation of habitats.
I think an outright ban on the importation/ownership of exotic species would be more beneficial overall. I am a responsible aquarist as well, I think this option would put the more focus on captive breeding and sustainable practices.