None. All fish need proper filtration and roomOnly some need large tanks and filters, The betta can live in a classic bowl. In a place where this is moderate light and they dont keed filters but...
Depends on what type of fish it is. Some fish can live up to 20 years!!!!
it differs when it comes to the species of fish.......obviously
4 years percicle it depeneds on the perpendicular angle of there spinal cord runing to there vertibrate.
3 years old(according to laoise)