In general big spook easy fish in small aquariums do this. They would be more effective if you manage to setup a chain reaction: A fish spooks and run into a rock pile, the rockpile falls and crack something etc
Are you hosting a fish karate demonstration party?
I suggest also design some head/eye/mouth guard for the said fish, breaking glass/running into rocks usually do nasty things to them.
Are you hosting a fish karate demonstration party?
I suggest also design some head/eye/mouth guard for the said fish, breaking glass/running into rocks usually do nasty things to them.