well when your spending $80 for a coral frag or $75 for a dwarf angel, I would rather test the water rather then stressing the fish and waiting for them to either start shriveling or losing their color before I do anything. But, on the fresh side, I dont test very regularly.... but I dont think you guys should generalize all fish keeping into one rule that you dont need to keep records...
Ox
But this isn't the marine section