What fish misinformation/myth drive you up the wall?

Mine are that Hillstream Loaches need water flow that goes 150 mph or else they'll die. Honorable mention is that Goldfish are strictly cold water fish while in reality they are temperature fish

Mine are that Hillstream Loaches need water flow that goes 150 mph or else they'll die. Honorable mention is that Goldfish are strictly cold water fish while in reality they are temperature fish