Badplankton, I think your mouse did what mine does all the time. It double clicked for some reason instead of once.
As for tank busters, my fav would be:
1. Arrowana ( I am also crossing my fingers in hopes to get 1 oneday.
2. Snakehead ( If the aquarium world were to have a serial killer, I think the snakehead would be a prime candidate. + I think they can grow quite large. )
3. Irredescent shark ( they probably shouldn"t be kept in aquariums but sure do bust tanks! )