Weather loaches do best with a neutral pH and in medium-hard water. You should keep at least 4 weather loaches together in your tank. They don't do well without the company of other fish of their species.Providing caves for them is best and it is also a good idea to provide some rocks with flat surfaces in their tank. Make sure the substrate has no sharp edges because weather loaches like to dig in it.This drop in barometric pressure causes a pressure change in their swim bladder.