How about 4000 hrs. of community service for the $4000 dollars of fish they killed, plus any fines, court costs and the actual $4000 of property they destroyed. I know 4000 hrs. seems like a lot, but it is punitive and meant to be severe and send a stern message. They can work at an animal shelter cleaning dog poop. After 2000 hrs. of doing nothing but that, they can start to slowly move up to more responsible positions within the shelter learning more about animal husbandry and how to properly care for these pets, i.e. dogs, cats. fish, reptiles, etc. Hopefully, this will instill within them a greater sense of value for all life...human or not. Cause these dopes, either through educational enlightenment or through the fear of jail time, need a deterrent from committing a crime like this again. A nice long 5-10 year probation thrown in on top of that community service where any infraction would get their deferred adjudication revoked and land them in jail for 12-24 months for (animal cruelty, destruction of property, vandalism, all of the above) would work nicely as well. At least that is what I would offer them if I was the DA handling the case (when they get caught).