have you have carbon in , i dont know why the meds did not get rid of it,but iv never had to use meds i do same as countrygal,just up the temp to speed up the life cycle of ich and add salt to kill it, after that if you still have it you should be looking for the cause of it, but i really think you should give us as much info as poss on what changes if any you made leading up to the outbreak,rember stress is main cause of ich,