How do they determine the "right" minimum size for a school of aquarium fish? For example, people usually say a given tetra species should be kept in groups of at least 5 - How do they determine that that's the best minimum number? Are there studies out there on the comfort levels of fish in groups of, say, three versus five versus seven? Last time I checked fish couldn't count, will a group of four fish really be that adversely affected?
By the way, I'm just asking this out of intellectual curiosity, not because I want to try adocating the keeping of only one neon tetra or some madness like that.
By the way, I'm just asking this out of intellectual curiosity, not because I want to try adocating the keeping of only one neon tetra or some madness like that.